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When was the last time nuclear fusion was talked about? Why isn't money being put into that? It is another possiable that requires far more energy than it makes, after all trying to copy how a star produces energy.
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They can now get more energy out than the put in using lasers to get the hydrogen atoms close enough to make helium. Next they need to figure out a way to sustain it.
As for biofuel, recently a type bacteria (e coli) was modified to produce bio fuel when fed, so it will soon be viable to create it in tank etc, rather than take up valuable farming land.
The biggest problem is overpopulation!! people need to start thinking, and act by only having on 1 or 2 children, there are too many of us on this planet.