If we really took this problem seriously, we'd be pushing hard on nuclear fusion research. I suspect we could have had fusion plants up and running before 2000 if there had been research funding. Now it's 2015 and we've got lots of fusion research projects limping along on shoestring budgets, plus ITER which is paralyzed by bureaucracy and international politics. (Remember the 20 years they wasted arguing over where to build it?)
If we managed the Apollo Program the way we've managed ITER, people today would still be laughing at the idea of space travel and joking that "A moon landing is thirty years away -- and always will be!"