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Did you know people can turn the energy in rushing water into electricity? This hydropower can run the computer and the lights in 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 hydropower.

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.