The heat energy from within the earth is known as geothermal energy. Scientists believe tapping geothermal energy would be a sustainable solution to reduce the effects of global warming and dependence on fossil fuels. This article gives a brief introduction to geothermal energy and how it works.
The term geothermal energy is derived from the Greek word "Geo" meaning "earth" and "Therme" meaning "heat". Hence, geothermal energy is the heat energy from within the earth. You could use the hot water (hot springs and geysers) and steam inside the earth's crust to produce electricity and also heat buildings. An interesting ecological fact is geothermal energy could be renewed. The water levels are recovered by timely rainfall and the heat is produced within the earth. Therefore the geothermal energy is a renewable source of energy.