It is not absurd, merely useless as a feasible power source.
Of course other people are welcome to work on this topic and indeed they must be. Perhaps you would like to inform us of what others have achieved with such investigations? Surely many nations around the world would like to have access to such promising technology too, if it is indeed true.
Nah,
It is completely absurd.
The problem of investing more energy in the system than you could get out of it is problem of fusion reactors ie hot fusion reactors like those who work on Tokamak. It is an engineering problem that would be overcome very soon ( within a decade ).An experimental 500MW Multinational Tokamak reactor is being constructed in Tolun, France ( ITER ), and it would be finshed by 2019, start operating by 2020 and go critical in 2027.The goal of this reactor is to produce as much energy as it consumes. A commercial reactor DEMO is planned with goal of producing 50 times power than it consumes Goal of 2-4 GW. It would be finished by 2040, and would go critical in 2050.
So yes Fusion power is coming, but not in our lifetime.
The problem with cold Fusion is that it is scientifically impossible. There may be some odd cold fusion reaction due to quantum tunneling effect , if you wait for long enough, but not on statistically significant scale.
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