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Geothermal energy : advantages disadvantages ~ , Geothermal energy energy obtained earth(geo) hot rocks present earth. produced due fission radioactive materials. http://www.ianswer4u.com/2012/02/geothermal-energy-advantages-and.html Renewable energy - wikipedia, Renewable energy flows involve natural phenomena sunlight, wind, tides, plant growth, geothermal heat, international energy agency explains. https://en.wikipedia.org/wiki/Renewable_energy A guide geothermal energy environment, I guide geothermal energy environment geothermal facilities located philippine cornfield (top left); mammoth lakes, california (top ); . http://www.geo-energy.org/reports/Environmental%20Guide.pdf