Did you know people can dig underground and use Earth's heat to make energy? This geothermal energy can power the computer and heat or cool your home. How exactly do we get it, though? And what is the impact on our environment? Read this book to find out all about geothermal energy.

What is geothermal energy? -- Collecting geothermal energy -- The pros and cons of geothermal energy -- Geothermal energy in the future.