9781422274552

Renewable Sources There are five types of renewable energy sources. ● ● Solar energy: energy from the sun in the form of heat and light. ● ● Hydro energy: the kinetic energy of water. ● ● Wind energy: the energy developed from strong winds. ● ● Geothermal energy: the energy produced from the heat inside Earth. ● ● Biomass energy: the energy produced from plants and trees. Fuels like ethanol and biodiesel are made of corn and vegetable oil respectively.

Climate Facts

● ● All fossil fuels were formed in the Carboniferous Period, which occurred from about 360 to 286 million years ago. ● ● In 2011, about 91 percent of all energy used in the United States was produced from nonrenewable sources and about 4 percent from renewable sources.

Preserving Energy

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