Geothermal energy is derived from the heat of the earth. This heat can be sourced close to the surface or even from reservoirs of hot water miles beneath the surface. This energy is harvested on a large scale by geothermal power plants, which are becoming far more popular with each passing year. However, for smaller buildings, a geothermal heat pump may be used to heat the building and even help keep it cool using the earth's natural energy.
Geothermal energy is also being used to heat water at fish farms, aid with a variety of industrial processes, help to run greenhouses and grow plants, or simply heat commercial buildings and reduce energy use.
The ocean is able to produce two types of sustainable energy, mechanical energy from the motion of the waves and thermal energy from the sun's heat. Systems that rely on warm water temperatures can easily convert ocean thermal energy into electricity. And ocean mechanical energy utilizes the tides caused by the rotation of the earth and gravity.
Hydrogen is commonly used to refine petroleum, produce fertilizer, treat metals, and process foods. It can also reduce energy costs when it powers marine vessels and remote buildings. Car companies are also experimenting with hydrogen fuel cells, which emit water vapor instead of harmful greenhouse gases, and the first U.S. hydrogen fueling stations are currently being tested in California.
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