- The sun provides solar energy that plants can use as the catalyst for photosynthesis. Plants use the solar radiation and would otherwise be unable to produce sugars needed to survive.
- According to the U.S. Department of Energy, coal supplies more than half of the energy used for generating electricity in the United States.
- According to the U.S. Department of Energy, petroleum is the primary source of energy and is used to generate 99 percent of the energy used for cars and trucks.
- In rural areas of undeveloped countries, such as in most in Africa, wood is used as the primary source of energy.
- The Department of Energy expects fossil fuel usage to continue to grow over the next 20 years because of increasing demands for cheap energy.
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