Fusion was impossible. Nobody would ever make a practical fusion reactor.
Jolene Wu didn't believe that. She was going to change the world with her fusor design, and free mankind from the tyranny of fossil fuels. But when the largest oil field in the world came up empty and gas prices spiked to ten dollars a gallon, it was no longer about changing the world.
It was about saving the world.

A Green Sun is a story that could happen tomorrow, a hard science fiction prediction of what might be, if mankind only had the courage to strive for building, instead of simply getting by with less and less. Like Robert Heinlein's "The Man Who Sold the Moon," this story is about building the future you choose, not passively accepting the future others say must be.