Lunar Power
An Anonymous Coward cites this article on ABC News, excerpting: "...the world would have access to a limitless power supply. The moon receives 13,000 terrawatts of power from the sun. Harnessing 1 percent of that energy, he calculates, could replace all fossil fuel power plants on Earth."
This is a really dumb idea. That energy is already being used by our ecosystem, and energy taken away from this will be directly destroying the environment. I wouldn't even recomend taking the energy away from a desert, much less a woodland. Why use solar energy if you don't get an environmental benefit? Pay the $150 billion and you'll reap a huge profit, if you work it out, I believe it will be substantially less money than goes into fossil fuel research and extraction.
-Ben