Geothermal energy is the heat within the earth. The word geothermal comes from the Greek words geo (earth) and therme (heat). Geothermal energy is a renewable energy source because heat is continuously produced inside the earth. The earth’s surface absorbs about 50 percent of the sun’s energy into the ground. This, and the radioactive decay … Continue reading Turkmenistan calls for mass harnessing of geothermal energy