Mankind had always been able to figure out alternatives. May be those Nuclear (Thorium, Uranium etc) & Solar based electricity coupled with hydrogen fueled & fuels cell vehicles will be the answer for fossil fuels in the coming decased..
If you meant India by "some countries", I believe, you cannot be any more wrong. I'll not dwell onto why, because it'll derail the current thread of importance of mutual co-operation.
However, I firmly believe that if we (India specifically) have to migrate to the next level of development (we had been somewhat stagnant at 7-9% since last few years), we will have to shed hostility with our neighbors (specifically China). As Mr. Dai Bingguo had rightly pointed out, we have seen in the recent past that, whenever India & China talks in unision, the world listens. That's a good sign & we should look to further our combined influence on the world. Be it environment, economics or geo-politics.