By Mason Inman
Published January 17, 2011
In a world where fossil fuel provides more than 80 percent of energy, what would it take to go completely green? Could the world switch over to power from only the wind, sun, waves, and heat from the Earth in only a few decades?
Two U.S. researchers, a transportation expert and an atmospheric scientist, decided the time had come to apply blue-sky thinking to one of the world’s greatest challenges.