Fossil Fuels are one of Earth's most important resources. Humans have come to rely on them as a source of energy. What exactly are fossil fuels? How does our dependence on them harm the environment? What are alternate sources of energy and how do we reverse the damage we've already done? Endangered Energy answers these questions by engaging readers with lively text, graphic features and stunning photography. Readers will discover why fossil fuels matter to them and the part they play in protecting them. Part of the Endangered Earth series.