This document provides information on various sources of energy including fossil fuels, renewable resources, hydroelectric, wind, solar, tidal, nuclear, and geothermal energy. It discusses the advantages and disadvantages of each source. For example, it notes that hydroelectric power is reliable and produces no emissions but dams are expensive to build and can impact the environment. Wind power is free and produces no pollution but the wind is unpredictable and wind farms may be considered unsightly.