Although far more feasible now than when first proposed in the late 70s, orbiting solar power satellites still look to be 'somewhat' unfeasible now, but maybe not to much further into the future.
I'm of the opinion hydrogen fusion is going to remain unfeasible for very, very much longer. (I do note, detonating a large hydrogen bomb, at extreme depths, and then utilizing the resulting contained heat to boil water and spin a turbine might be 'practical', from a strictly engineering stand point, but will remain unrealized from sociological constraints)
I'm of the opinion hydrogen fusion is going to remain unfeasible for very, very much longer. (I do note, detonating a large hydrogen bomb, at extreme depths, and then utilizing the resulting contained heat to boil water and spin a turbine might be 'practical', from a strictly engineering stand point, but will remain unrealized from sociological constraints)
