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Red willow whiz's work pays dividends in desert
By ZHANG ZHIHAO | China Daily | Updated: 2019-07-22 07:30
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Liu Mingting examines his red willow sapling. [Photo provided to China Daily]

Deep within the Taklimakan Desert, known by locals as the "Sea of Death", grows a unique type of shrub with reddish stems, small pink flowers and feathery, pale green foliage. Legend says the plant germinated from the blood of a young warrior who ventured into the desert to slay the drought demon.

When a sandstorm hits, the shrub's stems swing gracefully in the harrowing wind, decorating China's largest desert-337,000 square kilometers in area located in the Xinjiang Uygur autonomous region-with much-needed color and life.

The plant, commonly known as red willow or hongliu (Tamarix taklamakanensis), is more than a testimony to life's tenacity. It serves as the first line of defense, protecting other parts of China from the desert's sandstorms by fixing large patches of sand with its expansive root network.

While other types of red willow can be found in Central Asia and the Middle East, the discovery of the unique Chinese species by scientists six decades ago marked a milestone in China's desert control effort and brought new economic opportunities to the local Uygur population.

Liu Mingting, a world-renowned expert in desert control and a researcher at the Chinese Academy of Sciences' Xinjiang Institute of Ecology and Geography, said he still remembers the day when he first stumbled upon the plant decades ago.

In mid-July, the Publicity Department of the Communist Party of China Central Committee named the 86-year-old scientist as one of the "most admirable people to support the borderlands", a title given to 20 luminaries who have made profound and lasting contribution to China's western borders.

In 1956, Liu, a senior biology student at Lanzhou University in Gansu province, was interning at a field station in southern Xinjiang. There he saw a common red willow "battling fearlessly against the wind, sand, and salinity of the vast and unforgiving desert".

"This moved me tremendously," he recalled.

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Liu Mingting, a world-renowned expert in desert control and a researcher at the Chinese Academy of Sciences' Xinjiang Institute of Ecology and Geography. [Photo provided to China Daily]

Just before graduation, Liu wrote to Yang Xiufeng, then minister of higher education. He asked Yang to "send me to the most desolate place in China. Send me to the borderlands."

Liu got his wish and was later transferred to the Xinjiang institute with his family, where he spent decades finding and breeding the ideal red willow species to serve as cheap and effective sandstorm buffers.

"Desert control is a very tough job. The work environment is very desolate and the weather is hot, so not many people wanted to go with me," Liu said. "But I made a promise to myself. I came to Xinjiang because I wanted to ameliorate the barren environment."

During an expedition into the Taklimakan Desert in 1959, Liu finally found the right red willow species he was looking for. Discovering the right species was just the first step; the next was to mass cultivate and plant them around the desert border, creating "an artificial green buffer zone", Liu said.

He later discovered four more species, becoming one of the world's leading experts in tackling desertification. He was revered by peers from the United Nations Environment Programme as "Liu Hongliu".

Liu then spent the next two decades researching red willows in the desert, increasing the per hectare yield from 750,000 shrubs to 7.5 million. During this period, Qira and Keriya counties near the desert's edge were constantly battered by sandstorms, which devastated crops and impoverished residents, driving them from their homes. Lyrics in a local folk ballad even mention "eating sand and dirt day in and day out".

In 1982, an emergency report reached the autonomous region's government detailing how shifting sands were just 1.5 km from Qira. The local government immediately launched a massive desert control project to save the county.

Liu and his team were tasked with fixing 4,000 hectares of shifting sand within five years. The red willows he discovered played a significant role as the centerpiece of his geoengineering efforts, and Liu completed his task within three years.

After a decade, Liu had pushed the edge of the desert away from the county by more than 10 km, saving more than 38 villages in the process. While making the region safe to inhabit, Liu said he lost count of how many times he and his crew got lost in the desert or faced life-threatening dangers.

At age 81, Liu was involved in a car accident during field work, breaking seven ribs.

"Field work is very dangerous, but I can't just give up because it is tough," he said. "There is so much work to be done, and I will continue doing it until my death.

"Those who come to Xinjiang must learn to love this land and its people, and try to serve them as the best you can. Even if it is just doing one thing for your entire life, it is worth it."

After saving remote Xinjiang villages from natural disasters, Liu noticed the locals were still poor, so he turned his attention to using the red willow to help the impoverished people make some money.

"Desert control was traditionally a massive resource drain that produced nothing in return. I wanted to make it more sustainable and profitable so locals would be motivated to support it and become rich in the process," he said.

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Liu Mingting, a world-renowned expert in desert control and a researcher at the Chinese Academy of Sciences' Xinjiang Institute of Ecology and Geography. [Photo provided to China Daily]

In 1986, Liu successfully bred a special kind of red willow whose root can grow a rare parasitic medical plant called Cistanche deserticola, also known as desert broomrape. The plant has been used in traditional Chinese medicine as an expensive ingredient to treat body fatigue and improve virility.

However, the project didn't take off until 1993, when officials from Keriya visited Liu to pick his brain for commercial ideas. Liu introduced them to his broomrape project, and the officials were thrilled to find an industry they could rely on.

Now, the broomrape-producing red willow has been planted across hundreds of thousands of hectares in Xinjiang and the Inner Mongolia autonomous region, Gansu province and other sandy regions around China.

One hectare of such red willow can produce 60,000 to 120,000 yuan ($8,719 to $17,438) of revenue a year.

"Now many of my Xinjiang friends have ditched their donkey carts for small sedans," Liu said. "Science and technology should never be locked in a drawer, they should be used to help the people."

Despite his age, Liu still travels around Xinjiang and nearby provinces, often on a motorbike, to offer free lessons to farmers trying to plant his red willow.

"If my hard work can help millions of families become rich, anything is worth it," Liu said. "I am glad I can do something positive for Xinjiang. Nothing can stop me from doing more."
 
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Several villages in Yunnan suffer from poor water systems
By Zhang Han Source:Global Times Published: 2019/7/24 23:18:41

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An old woman in Southwest China's Yunnan Province carries water during dry season in 2010. Photo:VCG

A city government in Southwest China's Yunnan Province began to investigate a village drinking water system which reportedly never functioned since it was built in 2010 and has affected 240 families.

The government of Xuanwei, Yunnan Province formed an investigation team after media uncovered an empty reservoir in Jiuwu village in Xuanwei.

Villagers had to walk a long way to get water for daily use, media reported.

The government had promised Jiuwu village residents it would divert clean water to the reservoir, and asked them to dig channels and lay water pipes. Each household also paid for a water meter. But the system never sent water, even elderly people and children had to walk for an hour twice a day to fetch water.

A total of 240 families were reportedly affected, according to CCTV.

CCTV cited official documents and said the reservoir cost 210,000 yuan ($31,300) and is functioning, while a village water affairs official said that the project only cost 70,000 to 80,000 yuan.

An official from the Xuanwei government's discipline inspection bureau on Wednesday told the Global Times that government chiefs have gone to the village to verify the situation. She declined to provide more details on the investigation.

Jiuwu is not the only village in Xuanwei facing such a problem. A woman surnamed Bao from Deji village said that her family was mobilized to construct the water system five years ago. "But water never ran through the pipe and my parents in their 50s have to walk about five kilometers every day and return with heavy buckets," Bao said.

Another villager from nearby Malong village reached by Global Times also said drinking water in his village contains mud, twigs and insects.

The Xuanwei government held a meeting last week to speed up the construction of the drinking water project, requiring water security projects in all villages to be completed by August.
 
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China to expand forests in Greater Khingan Range
Source: Xinhua| 2019-07-26 23:12:00|Editor: Yamei

HOHHOT, July 26 (Xinhua) -- North China's Inner Mongolia Autonomous Region plans to plant 66,666.7 hectares of trees in the Greater Hinggan Range in the next three years, local authorities said Friday.

The Hinggan League in the region has planned six projects to expand the forests, including encouraging forestry and fruit farming, returning grain plots to forestry, and ecological restoration in desert, said Bai Changfeng, head of the league's forestry and grassland administration.

Since this spring, the league has invested over 700 million yuan (101.8 million U.S. dollars) in building 24,533 hectares of forests.

The Greater Khingan Range is China's largest state-owned prairie in terms of continuous area. Statistics show that between 1998 and 2018, the Inner Mongolia section of the Greater Khingan Range was expanded by over 1.39 million hectares.
 
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Cleaner fuel needed to help reduce indoor air pollution in rural areas
By WANG XIAODONG | China Daily | Updated: 2019-07-29 09:08
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An apartment rented through online long-term rental apartment operator Ziroom. [Photo/Ziroom]

Indoor air pollution is still very serious in many rural areas in China-despite the general improvement in outdoor air quality across China in recent years-and more effort is needed to promote the use of clean fuel, a top environmental scientist said.

Compared with outdoor air quality, the public has generally ignored air quality indoors, which is more important to people's health as people spend most of their time indoors, said Tao Shu, a member of the Chinese Academy of Sciences.

"National surveys show most people spend more than 22 hours a day indoors," said Tao, who is also an environmental professor at Peking University. "So, by solving outdoor air pollution, we have only solved a small part of the whole problem of air pollution."

Compared with urban residents, who may also suffer indoor air pollution due to excessive levels of toxic substances such as formaldehyde emitted after home renovations, many rural residents in China face more serious indoor air pollution due to a lack of clean fuel, he said.

"In rural areas, especially in the less developed northwest, southwest and northeast regions, many people still use wood and straw for cooking and heating," he said. "In North China, coal is still commonly used in houses in rural areas for such purposes.

"Burning such materials can release a lot of PM2.5, which causes very serious harm to health."

Many rural residents are not even aware of such harm and do not know how to protect themselves, he added.

Despite promotion of the use of clean fuels such as electricity and natural gas across China in recent years, about 30 percent of households in rural areas still used solid fuel such as straw or coal for cooking and heating in 2017, he said.

Outdoor air quality has improved across China in recent years due to pollution control efforts. Between 2013 and 2017, the average density of PM2.5 in China decreased by 14 percent, he said, citing the latest study by the academy.

With the ongoing emission reduction efforts, it is estimated that at least 95 percent of cities in China can achieve the target of reducing PM2.5 concentration to 35 micrograms per cubic meter by 2035, he said.

Last year, the average concentration of PM2.5 in 338 major cities in China was 39 mcg per cubic meter, a decrease of 9.3 percent year-on-year, according to the Ministry of Ecology and Environment.

Reducing indoor air pollution has also been put high on the government's agenda. In a national health promotion plan released by the National Health Commission earlier this month, the commission called on the public to pay attention to indoor air pollution and take measures such as using green materials when renovating buildings, using clean fuels for cooking and heating and installing air purification systems if possible in times of serious outdoor air pollution.

Cui Gang, a disease control and prevention official at the commission, said the commission has intensified monitoring of air pollution-especially the concentration of PM2.5-and research on its relation to health in recent years. The commission will conduct health-risk evaluations to provide a basis for improving health strategies and policies, he said.
 
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China is on track to meet its climate change goals nine years early | New Scientist
26 July 2019
By Adam Vaughan

China appears on track to reach its carbon goals up to nine years earlier than planned under the Paris agreement, in a potential huge boost for efforts to tackle climate change.

The world’s biggest polluter accounts for a quarter of humanity’s emissions today, making the nation a crucial part of any efforts to avoid dangerous global warming.

Now an analysis has found that China’s emissions could peak at 13 to 16 gigatonnes of CO2 between 2021 and 2025, making what the researchers call a “a great contribution” to meeting the Paris deal’s goal of limiting temperature rises to 2°C. The official target is a peak by “around 2030.”

“It reflects China’s great efforts in mitigating climate change and the ‘new normal’ of the economy, from high speed to high quality, which might cause CO2 emissions to peak earlier,” says Haikun Wang of Nanjing University. His Chinese-US team calculated their dates by looking at historical carbon emissions and GDP data for 50 Chinese cities between 2000 and 2016. They found that emissions tend to peak at 10.2 tonnes of CO2 per person when GDP hits around $21,000 per person.

The cities are responsible for 35 per cent of China’s total emissions, from which the researchers extrapolated a national picture, projecting it forward to find a peak. The possibility of China delivering early on its international target will be a boost for UN climate talks. Under the Paris deal, countries are due to submit revised and improved carbon targets next year.

The possibility of an early peak has been driven by the changing nature of China’s economy, a shift which is likely to continue. “As China moves towards a higher tech and service economy, it is likely to show how the passage to a low-carbon economy and robust and sustainable growth in an emerging market economy can be mutually supportive,” says Nicholas Stern, of the London School of Economics. The expectation of a peak by 2025 is in line with the lower end of other projections.

However, Haikun and colleagues admit they didn’t analyse many small cities, which have the potential to develop more, so the real emissions may end up higher. The US-based thinktank World Resources Institute also says that while more countries are peaking emissions – 57 are due by 2030, up from 19 in 1990 – it will still not be enough to make global emissions peak in the next few years.

Journal reference: Nature Sustainability, DOI: 10.1038/s41893-019-0339-6
 
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From greenhouse gas to fuel
Novel catalysis approach reduces carbon dioxide to methane

Date: August 1, 2019
Source: University of Delaware

A growing number of scientists are looking for fast, cost-effective ways to convert carbon dioxide gas into valuable chemicals and fuels.

Now, an international team of researchers has revealed a new approach that utilizes a series of catalytic reactions to electrochemically reduce carbon dioxide to methane, the main ingredient in natural gas, eliminating an intermediate step usually needed in the reduction process.

"We want to supply renewable electricity and take carbon dioxide from the atmosphere and convert it to something else in one step," said Bingjun Xu , a University of Delaware assistant professor of chemical and biomolecular engineering. "This is a key contribution to this vision."

The team's results were published in the journal Nature Communications on July 26, 2019. Two of the study authors are based at UD: Xu and postdoctoral associate Xiaoxia Chang. Another study author, Qi Lu of Tsinghua University in China, was formerly a postdoctoral associate in the Department of Chemical and Biomolecular Engineering at UD.

The paper's authors also include Haochen Zhen from Tsinghua University, Jingguang Chen from Columbia University, William Goddard III from the California Institute of Technology and Mu-Jeng Cheng from National Cheng Kung University in Taiwan.

A one-pot system
To convert carbon dioxide into valuable fuels, you have to start with a surface made of copper, the metal famous for its use in pennies and electrical wiring. Copper can be used to reduce carbon dioxide into carbon monoxide, which can then be further transformed into substances such as methane. This process is relatively simple, but it requires two reactors and costly separation and purification steps.

The research team used computations and experiments to design a one-pot catalysis system. Add carbon dioxide, and a series of chemical reactions will happen without the need to stop and add more chemicals.

To do this, the team added special nanostructured silver surfaces, which were developed by Lu when he was a postdoctoral associate at UD from 2012 to 2015, to the copper surfaces. The silver portion attracts carbon monoxide molecules, which then migrate to the copper portion and reduce to methane. The system yields a higher concentration of methane than copper-only systems.

"In this work the primary novelty is to combine these two in a configuration so that several steps of reaction could occur in one system," said Xu. "We systematically modified the composition, the silver-to-copper ratio in the structure. Those are key to the selectivity and ability to combine the reactions."

Previous attempts to combine copper with precious metal in this way have failed, but the group developed a special type of electrode structure that enabled the system. The research was the result of a collaborative effort with research groups contributing spectroscopy, computation, and studies of the reactivity of materials.

Story Source:
Materials provided by University of Delaware. Original written by Julie Stewart. Note: Content may be edited for style and length.
Journal Reference:
  1. Haochen Zhang, Xiaoxia Chang, Jingguang G. Chen, William A. Goddard, Bingjun Xu, Mu-Jeng Cheng, Qi Lu. Computational and experimental demonstrations of one-pot tandem catalysis for electrochemical carbon dioxide reduction to methane. Nature Communications, 2019; 10 (1) DOI: 10.1038/s41467-019-11292-9


From greenhouse gas to fuel: Novel catalysis approach reduces carbon dioxide to methane -- ScienceDaily
 
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More pocket parks for city
Hu Min 20:02 UTC+8, 2019-08-06

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A pocket park in Huangpu District

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A pocket park in Minhang District

Shanghai will have more than 150 pocket parks by next year, the city's greenery authorities announced on Tuesday.

These small open greenery spaces along city streets, commercial blocks or residential complexes provide a place for residents to enjoy a rest or take a stroll.

The city had 91 such parks by the end of last year, according to the Shanghai Greenery and Public Sanitation Bureau.

Among them, the magnolia garden in Huangpu District has introduced nearly 20 varieties of new magnolia plants in its recent renovation, while landscapes of the Baoshan Senyuan Garden in Baoshan District are connected by stone paths and there is a rainwater collection landscape belt, the bureau said.

The target is to make the city's forest coverage reach 18 percent by 2020, and the average per capita park greenery space 8.5 square meters.

Source: SHINE Editor: Cai Wenjun
 
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China shows the way on environmental protection
China.org.cn, August 7, 2019
By Rachana Gupta

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An electric bus runs on the Yanggongdi Causeway in the West Lake scenic area in Hangzhou, east China's Zhejiang province, on July 28, 2018. [Photo/Xinhua]

Two recent studies suggest China will be able to achieve its commitments to the Paris accord on protecting the environment much earlier than expected, making a great contribution to tackling a crucial issue for human survival.

One recent study, conducted by a team of researchers from the Chinese Academy of Sciences, Nanjing University, and Harvard University, published in the magazine Nature Sustainability, highlighted that China could achieve its commitment approximately a decade earlier than the scheduled target.

Another study by Kelly Sims Gallagher of the Fletcher School of Law and Diplomacy of Tufts University, earlier this year came to a similar conclusion.

Notably, China, in its commitment to the U.N. in 2015 had pledged to contain its greenhouse gas emissions per unit of GDP to 60-65% of the 2005 levels. Additionally, it vowed to boost its share of non-fossil fuels in primary energy consumption to about 20% by 2030. This, it stated, would be accomplished by expanding its installed capacity of wind power to 200 GW and solar power to around 100 GW, up from 95.81 and 28 GW respectively as on November 2015.

According to the Sino-American study, per capita emissions would plunge with the corresponding rise of per capita income in a sample of 50 Chinese cities, and that this could be replicated nationwide, which could stimulate an overall reduction in the carbon dioxide emission level.

Therefore, despite the current target for emissions peaking by 2030, in reality, it could shrink somewhere between 2021 and 2025, thus facilitating China to achieve its commitment to the Paris agreement well ahead of schedule.

Haikun Wang of Nanjing University, a key researcher of the study, said: "It reflects China's great efforts in mitigating climate change and the 'new normal' of the economy, from high speed to high quality, which might cause carbon dioxide emissions to peak earlier."

This is in line with the Chinese government's vision of fostering high-quality economic growth and transforming the country into a green economy. These findings are especially important with the United Nations' Climate Action Summit coming up shortly when countries are expected to present their respective roadmaps on fulfilling their Paris commitments. The summit is scheduled to be held on September 23 this year in New York.

China has been the world's leading pollution emitter for more than a decade, accounting for 27% of global carbon dioxide emissions. The Chinese cities, as a result of rapid urbanization, account for more than 35% to the country's total emissions.

Thus, it is a key player in terms of its contribution to the U.N. to achieve its target of capping carbon emissions so the rise in global temperatures can be kept under two degrees Celsius by the end of the century.

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An aerial photo of solar photovoltaic panels in Hengyang city, central China's Hunan province, on March 19, 2019. [Photo/Xinhua]

Thankfully, in the last several years, China has taken numerous measures to fulfill its commitments. For instance, it has cut down its reliance on fossil fuels such as coal from 68.5% in 2012 to 59% today. Especially, the country's carbon emissions per GDP unit had dropped by 46% in 2017 from 2005 levels, meaning it has achieved its Copenhagen climate target of 40-45% reduction by 2020 from 2005 level three years ahead of schedule.

At the same time, the country's solar and wind energy component is expanding at a rapid rate. The solar-power capacity of the country had reached almost 130 GW while the wind capacity had reached 169 GW in 2017, which is higher than any other country in the world.

Moreover, according to Bloomberg New Energy Finance, China, in 2017, invested almost $133 billion in renewable energy, which was more than twice the investment in the U.S. Remarkably, China had already surpassed America in its investment in renewable energy sources in 2012.

Sadly, the efforts made in the direction of protecting environment are still not enough. According to Luis Alfonso de Alba, the U.N. Secretary-General's Special Envoy for the 2019 Climate Summit, at the current rate of emission, the global temperature will increase by more than three degrees Celsius failing the Paris agreement target of 1.5 degree Celsius.

Considering that some of the developed economies are backing out from their commitments towards meeting their NDC pledges, it becomes imperative for a major stakeholder like China to lead by example.

Already China is pushing its targets of reducing its greenhouse gas emissions by implementing more stringent measures. Therefore, looking at the relentless efforts of the country along with the results of the recent studies, it can be said that China is in the right path towards exceeding its climate targets which is beneficial not just for itself but also for the whole planet.

Rachana Gupta is an active blogger, poet and freenlance content writer.

Opinion articles reflect the views of their authors only, not necessarily those of China.org.cn.

If you would like to contribute, please contact us at opinion@china.org.cn.
 
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New Process Discovered to Completely Degrade Flame Retardant in the Environment | Office of News & Media Relations | UMass Amherst
UMass Amherst research has potential application to remediate other difficult-to-degrade pollutants

August 8, 2019
Contact: Jun Wu 413-210-2729

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AMHERST, Mass. – A team of environmental scientists from the University of Massachusetts Amherst and China has for the first time used a dynamic, two-step process to completely degrade a common flame-retardant chemical, rendering the persistent global pollutant nontoxic.

This new process breaks down tetrabromobisophenol A (TBBPA) to harmless carbon dioxide and water. The discovery highlights the potential of using a special material, sulfidated nanoscale zerovalent iron (S-nZVI), in water treatment systems and in the natural environment to break down not only TBBPA but other organic refractory compounds that are difficult to degrade,says Jun Wu, a visiting Ph.D. student at UMass Amherst’s Stockbridge College of Agriculture and lead author of the paper published in Environmental Science & Technology.

“This is the first research about this dynamic, oxic/anoxic process,” Wu says. “Usually, reduction or oxidation alone is used to remove TBBPA, facilitated by S-nZVI. We combined reduction and oxidation together to degrade it completely.”

Wu emphasizes that “the technique is technically simple and environmentally friendly. That is a key point to its application.”

The research is featured on the cover of ES&T, which is widely respected for publishing papers in the environmental disciplines that are both significant and original.

“This research can lead to a decrease in the potential risk of TBBPA to the environment and human health,” says Wu, who began the research at the University of Science and Technology of China in Hefei. At UMass Amherst, Wu works in the pioneering lab of Baoshan Xing, professor of environmental and soil chemistry, corresponding author of the new study and one of the world’s most highly cited researchers.

“Our research shows a feasible and environmentally friendly process to completely degrade refractory brominated flame retardants in a combined oxic and anoxic system,” Xing says. “This is important for getting rid of these harmful compounds from the environment, thus reducing the exposure and risk.”

Among the most common flame retardants that hinder combustion and slow the spread of fire, TBBPA is added to manufactured materials, including computer circuit boards and other electrical devices, papers, textiles and plastics.

Associated with a variety of health concerns, including cancer and hormone disruption, TBBPA has been widely detected in the environment, as well as in animals and human milk and plasma.

Although Wu and Xing’s research breaks new ground in the efforts to develop safe and effective processes to remediate groundwater and soil contaminated with TBBPA, they say more research is needed to learn how to best apply the process.

Their research was supported by grants from the National Natural Science Foundation of China and the USDA-National Institute of Food and Agriculture’s Hatch Program.
 
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Xi’an applies navigation satellite system in taxis for real-time pollution monitoring
By Wang Qi Source:Global Times Published: 2019/8/14 22:03:09

Taxis in Xi'an, Northwest China's Shaanxi Province now play an important role in the monitoring and reporting of pollution as China's independently developed navigation satellite system has been installed in them.

About 200 taxis were equipped with "vehicle-mounted mobile atmospheric monitoring equipment" on August 7, making the real-time monitoring and reporting of PM 2.5 and PM 10 pollutants much easier.

According to reports, the setup uses China's domestically developed BeiDou Global Navigation Satellite System, as well as General Packet Radio Service (GPRS).

Without any inconvenience caused to passengers, the equipment was fixed on the roofs of taxis, local Xi'an news site xiancn.com reported.

According to the site, the equipment is able to monitor PM2.5 and PM10 at the same time, with a data transmission speed of three per second.

Each taxi can generate 14,400 pieces of data per day. After the data is transmitted to a cloud platform, researchers can detect dust pollution and release information to residents, as well as finding solutions to control the pollution.

"The timely data generated through taxis can enrich the existing database, making the monitoring more accurate and authentic and conducting air pollution control in a more effective way," Luo Yameng, a Beijing-based urban planning and eco-city expert, told the Global Times on Wednesday.

In the past, most of the air-quality monitoring spots were in parks and other places with clean environments, and sometimes local governments repeatedly sprayed water near the air quality monitoring points to temporarily reduce dust pollution, so the data did not reflect the real air pollution situation in the city, explained Luo.

Before its debut in Xi'an, the technology had been through debugging and commissioning for about half a year, said xiancn.com.

Six pilot cabs in Kunming, Southeast China's Yunnan Province, tried the equipment at the end of last year and received a good response. Shanghai conducted a similar trial early this year with the assistance of a research team from Shanghai-based Tongji University.
 
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Plant fiber turning desert to oasis
By Tan Yingzi | chinadaily.com.cn | Updated: 2017-11-06 14:54
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Turning a desert into an oasis is not a dream anymore. Yi Zhijian, a professor at Chongqing Jiaotong University, and his team have invented a plant fiber binder to transform sand into soil for farming, and the experiment is going smoothly in Inner Mongolia, Chongqing Daily reported.

The Ulanbuh Desert, about 14,000 square kilometers in area, lies on the west bank of the Yellow River in Alshaa League, Inner Mongolia autonomous region. Every spring, Beijing's sandstorms originate here.

In May 2016, the team successfully made about 16,667 square meters survive in the edge of the Ulanbuh Desert, two kilometers from the west bank of the Yellow River. In 2017, another experimental area of 2 square kilometers is now covered with hundreds of plants planted in February, such as trees, grass and crops.

video -> China daily video
 
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Eco-China: Tibet Autonomous Region
Source: Xinhua| 2019-08-17 14:55:46|Editor: huaxia


Tibet Autonomous Region has seen significant progress in restoring biodiversity.

BEIJING, Aug. 17, 2019 (Xinhua) -- Tibet Autonomous Region is located in southwest China, it has seen significant progress in restoring biodiversity, with a forest coverage rate of 12.14 percent, said a white paper released in March this year by China's State Council Information Office.

The population of Tibetan antelopes has grown from 60,000 in the 1990s to more than 200,000 and Tibetan wild donkeys have increased in numbers from 50,000 to 80,000, noted the document, titled "Democratic Reform in Tibet -- Sixty Years On."

Since the Qomolangma Nature Reserve was established in 1988, Tibet has set up 47 nature reserves of all kinds, including 11 at state level, with the total area of nature reserves accounting for more than 34.35 percent of the total area of the autonomous region, the white paper said. Tibet has 22 eco-protection areas, including one at state level, 36 counties in receipt of transfer payments from central finance for their key ecological roles, four national scenic areas, nine national forest parks, 22 national wetland parks, and three national geoparks, figures showed.

The central government has continued to increase eco-compensation for Tibet in return for its cost for protecting the eco-environment and the consequent losses in development opportunities. The white paper said that since 2001, the central government has paid 31.6 billion yuan (4.71 billion U.S. dollars) in eco-compensation to the autonomous region for protecting forests, grassland, wetland, and key ecological reserves.

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Tourists visit the Tibet Garden at the Beijing International Horticultural Exhibition in Beijing, capital of China. (Xinhua/Ren Chao)

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Tourists visit the Tibet Garden at the Beijing International Horticultural Exhibition in Beijing, capital of China. (Xinhua/Ren Chao)

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Yaks on a wetland in northern Tibet Autonomous Region, southwest China. (Xinhua/Purbu Zhaxi)

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Sea of clouds over Medog County, southwest China's Tibet Autonomous Region. (Xinhua/Li Xin)

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Scenery of Bome County of Nyingchi, southwest China's Tibet Autonomous Region. (Xinhua/Li Xin)

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Scenery of Nam Co Lake in southwest China's Tibet Autonomous Region. (Xinhua/Li Xin)

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Scenery of the Yamzbog Yumco Lake in Shannan, southwest China's Tibet Autonomous Region.(Xinhua/Jigme Dorje)

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Tibetan wild donkeys on a pasture in Zanda County, southwest China's Tibet Autonomous Region.(Xinhua/Jigme Dorje)

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Scenery of a part of a glacier in Rutog County of Ngari Prefecture, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

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Banggong Co in Ngari Prefecture, southwest China's Tibet Autonomous Region. (Xinhua/Jigme Dorje)

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Black-necked cranes in Linzhou County of Lhasa, southwest China's Tibet Autonomous Region. (Xinhua/Zhang Rufeng)

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Glacier on the foot of Mount Qomolangma in southwest China's Tibet Autonomous Region.(Xinhua/Purbu Zhaxi)

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Tangra Yumco Lake in Nagqu, southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

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Tibetan antelopes in Qiangtang National Nature Reserve in southwest China's Tibet Autonomous Region.(Xinhua/Purbu Zhaxi)

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Peach flowers in suburb of Lhasa, southwest China's Tibet Autonomous Region. (Xinhua/Purbu Zhaxi)

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Trees planted along banks of the Yarlung Zangbo River in southwest China's Tibet Autonomous Region.(Xinhua/Purbu Zhaxi)

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Lhalu Wetland National Nature Reserve in Lhasa, southwest China's Tibet Autonomous Region.(Xinhua/Purbu Zhaxi)
 
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New system improves coking wastewater treatment efficiency
Source: Xinhua| 2019-08-19 23:49:08|Editor: Mu Xuequan

BEIJING, Aug. 19 (Xinhua) -- Chinese researchers have developed a system for the treatment of coking wastewater from large-scale industries with lower costs and higher efficiency.

Heating coal over high temperatures provides both heat and carbon (coke) required for iron production. During the process, recycled scrubber water, which is used as a coolant, contains large amounts of suspended solids and chemicals that are toxic to the environment and biological systems.

In China, more than 100 million tonnes of such wastewater is produced from the coking industries. On April 16, 2015, China issued its Action Plan for the Prevention and Control of Water Pollution to ensure water safety.

However, the conventional end-of-pipe treatment, which processes waste before discharging, ends up in higher costs and low efficiency, hindering the sustainable development of the industries.

Based on the idea of whole-process pollution control, researchers from the Institute of Process Engineering (IPE), Chinese Academy of Sciences, lowered the cost of coking wastewater treatment by 20 percent in their new system, and achieved stable and efficient removal of toxic and polluting particles.

So far, the system has been used in 41 water pollution control projects in large Chinese enterprises like Ansteel, Wuhan Iron and Steel Corporation and China Coal Energy.

According to the IPE researchers, the installed systems now can treat more than 55.2 million tonnes of coking wastewater every year.

Over the past three years, the systems have treated 152 million tonnes of coking wastewater, recycling 750,000 tonnes of tar and reducing emissions of 240,000 tonnes of carbon dioxide as well as 90,000 tonnes of ammonia nitrogen.

The researchers said the system enables the coking industries to meet the national standards for industrial wastewater discharges, achieving efficient pollution control with low-cost operation.
 
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New system improves coking wastewater treatment efficiency
Source: Xinhua| 2019-08-19 23:49:08|Editor: Mu Xuequan

BEIJING, Aug. 19 (Xinhua) -- Chinese researchers have developed a system for the treatment of coking wastewater from large-scale industries with lower costs and higher efficiency.

Heating coal over high temperatures provides both heat and carbon (coke) required for iron production. During the process, recycled scrubber water, which is used as a coolant, contains large amounts of suspended solids and chemicals that are toxic to the environment and biological systems.

In China, more than 100 million tonnes of such wastewater is produced from the coking industries. On April 16, 2015, China issued its Action Plan for the Prevention and Control of Water Pollution to ensure water safety.

However, the conventional end-of-pipe treatment, which processes waste before discharging, ends up in higher costs and low efficiency, hindering the sustainable development of the industries.

Based on the idea of whole-process pollution control, researchers from the Institute of Process Engineering (IPE), Chinese Academy of Sciences, lowered the cost of coking wastewater treatment by 20 percent in their new system, and achieved stable and efficient removal of toxic and polluting particles.

So far, the system has been used in 41 water pollution control projects in large Chinese enterprises like Ansteel, Wuhan Iron and Steel Corporation and China Coal Energy.

According to the IPE researchers, the installed systems now can treat more than 55.2 million tonnes of coking wastewater every year.

Over the past three years, the systems have treated 152 million tonnes of coking wastewater, recycling 750,000 tonnes of tar and reducing emissions of 240,000 tonnes of carbon dioxide as well as 90,000 tonnes of ammonia nitrogen.

The researchers said the system enables the coking industries to meet the national standards for industrial wastewater discharges, achieving efficient pollution control with low-cost operation.
Good progress, China need more and more industry waste water treatment. 青山绿水就是金山银山。
 
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NEWS RELEASE 2-SEP-2019
How much carbon the land can stomach with more carbon dioxide in the air

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The Yaluzangbu canyon. CREDIT: YU Liang

About 600 petagrams, or 600 billion tons of carbon (the weight of about 100 billion really big elephants), was emitted as carbon dioxide from 1750-2015 due to fossil fuel burning, cement production and land-use change. About one-third of this was absorbed by land ecosystems.

Plants pull carbon dioxide out of the atmosphere by "eating" it, i.e., converting the carbon dioxide into sugars and starches, aka photosynthesis. Fortunately, plants' appetite for carbon dioxide is pretty good: The more carbon dioxide we have in the air, the faster the plants eat.

When a terrestrial ecosystem absorbs more carbon from human carbon dioxide emissions than it emits, it is called a carbon sink; otherwise, it is a carbon source. Scientists have found that rising carbon dioxide concentration in the air enhances land carbon sink, a process known as carbon dioxide fertilization. Quantifying carbon dioxide fertilization is critical for understanding and predicting how climate will affect and be affected by the carbon cycle.

Recently, researchers from 28 institutions in nine countries succeeded in quantifying carbon dioxide fertilization for the past five decades, using simulations from 12 terrestrial ecosystem models and observations from seven field carbon dioxide enrichment experiments.

They found that the sensitivity of northern temperate carbon sink to rising carbon dioxide concentration is linearly related to the site-scale sensitivity across the models. Based on this emergent relationship and field experiment observations as a constraint, the study estimated that for every 100-ppm increase in carbon dioxide in the air (equivalent to about one flea per one liter of water), terrestrial carbon dioxide sink increases by 6.4 billion tons (equivalent to 1.4 billion really big elephants) of carbon per year in the temperate Northern Hemisphere, and 35 billion tons of carbon per year globally. The team also revealed that carbon dioxide fertilization is primarily responsible for the observed increase in global terrestrial carbon sink.

"This study reduces uncertainty in the understanding of the carbon dioxide fertilization effect on terrestrial carbon sink," said co-author Dr. PIAO Shilong of the College of Urban and Environmental Sciences at Peking University. "The new approach and techniques in this study will be very useful to the scientific community in future research and studies."

"To explain further mechanisms underlying the carbon dioxide fertilization effect, more longer-term field experiments are required, particularly in boreal and tropical ecosystems. Joint effort between experimentalists and modelers is also necessary," said Dr. LIU Yongwen, lead author of the study and a research scientist at the Institute of Tibetan Plateau Research, Chinese Academy of Sciences.

Studies have shown the capacity of terrestrial ecosystems to absorb carbon dioxide is growing. This is good news since the process can slow the accumulation of carbon dioxide in the air and thus the pace of climate change. Credit should go to carbon dioxide fertilization, the extended growing season for vegetation, and reforestation, all of which help pull carbon from the atmosphere. At the same time, however, factors such as fire, heat waves and permafrost thawing - among other increasingly common global warming ills - are changing previous carbon sinks into carbon sources.


How much carbon the land can stomach with more carbon dioxide in the air | EurekAlert! Science News
 
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