The environmental effects of geothermal energy depend on how geothermal energy is used or on how it is converted to useful energy. Direct use applications and geothermal heat pumps have almost no negative effects on the environment. In fact, they can have a positive effect by reducing the use of energy sources that have negative effects on the environment.
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Geothermal power plants have low emission levels
Geothermal power plants do not burn fuel to generate electricity, so the levels of air pollutants they emit are low. Geothermal power plants emit 97% less acid rain-causing sulfur compounds and about 99% less carbon dioxide than fossil fuel power plants of similar size. Geothermal power plants use scrubbers to remove the hydrogen sulfide naturally found in geothermal reservoirs. Geothermal power plants inject the geothermal steam and water that they use back into the earth. This recycling helps to renew the geothermal resource.
Many geothermal features are national treasures
Geothermal features in national parks, like geysers and fumaroles in Yellowstone National Park, are protected by law.