We need energy, and lots of it - but some of the ways we generate energy put life on Earth in danger. We already have some planet-friendly alternatives, but we're going to need more. This book imagines a future world packed with exciting, innovative renewable energy technology. It explains what that technology might look like, how it will work, and how it will change the world we live in for the better. It looks all the way to a future where energy can be generated in outer space - one day, enough to fuel the entire solar system. Technology covered includes: solar power - in space; wind turbines - high in the sky; nuclear fusion; wave power; geothermal energy; new forms of transport, from airships to hydrogen planes to solar-powered ships; new sources of food and new types of farm; innovative ways to store energy.