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No we don't use that much geothermal energy. In the USA only 22 countries that use geothermal energy.

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Yes we use too much coal. In Chine alone, 670,000 people died per year as a result of coal-related air pollution.

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Coal is the world's most abundant fossil fuel - more plentiful than oil and natural gas. Coal is second only to oil as a source of energy that we use.

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Geothermal Energy Technology - RenewableEnergyWorld.com
https://planetsave.com/2016/02/11/geothermal-energy-advantages-and-disadvantages/
https://study.com/.../geothermal-and-tidal-energy-advantages-and-disadvantages.html
https://vittana.org/14-advantages-and-disadvantages-of-coal
https://sunglitz.wordpress.com/.../advantages-and-disadvantages-of-using-coal-energy/
www.cbv.ns.ca/coalnovascotia/coal_facts.html

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The world geothermal comes from Greek words meaning 'Earth' (geo) and 'heat' (thermos).
The technology behind geothermal electricity generation has improved substantially but it still only provides a fraction of world electricity generation.

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Geothermal electricity generation is currently used in 24 countries, while geothermal heating is in use in 70 countries. As of 2015, worldwide geothermal power capacity amounts to 12.8 gigawatts, of which 28 percent or 3,548 megawatts are installed in the United States.

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Some ways we can use less coal is turning off the lights.
Use energy saving bulbs.

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How much coal do we human use in a year 

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How much coal do we human use in a year 

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9 out of every 10 tons of coal mined each year in the U.S. is used for domestic electricity generation. Each person in the U.S. uses 3.7 tons of coal annually. Coal is the most affordable source of power fuel per million. Historically averaging less than one-quarter the price of petroleum and natural gas.

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There are many advantages to geothermal energy. Geothermal energy is renewable energy because once water or steam is used, it can be pumped back into the ground. It is also clean energy. Geothermal power plants, unlike plants that burn fossil fuels, do not produce greenhouse gases that can be harmful to the atmosphere.

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Geothermal Energy Disadvantages. Potential emissions – Greenhouse gas below Earth's surface can potentially migrate to the surface and into the atmosphere. Surface Instability – Construction of geothermal power plants can affect the stability of land.

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Coal energy produces large amount of carbon dioxide which leads to global warming and climate change
The burning of coal is not environmental friendly because it produces harmful byproducts and gas emissions such as sulfur dioxide, carbon dioxide and nitrogen oxide that causes pollution to the environment including acid rain

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Advantages of using coal to produce electricity: Coal energy is an affordable energy source because of the coal's stable price compared to other fuel sources. Coal is easy to burn. Coal produces high energy upon combustion

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How is geothermal energy converted into electricity 

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How is geothermal energy converted into electricity 

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Water or working fluid is heated or used directly in case of geothermal dry steam power plants, and then sent through a steam turbine where the thermal energy heat is converted to electricity with a generator through a phenomenon called electromagnetic induction.

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The original source of energy of geothermal energy 

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The original source of energy of geothermal energy 

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Geothermal energy is the heat from the Earth. It's clean and sustainable. Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma.

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Simply put, coal-fired electricity generation is a five-step process: Thermal coal either black or brown that has been pulverised to a fine powder is burned. The resulting heat is used to turn water into steam. The steam at very high pressure is then used to spin a turbine, connected to an electrical generator.

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coal is a fossil fuel.