GEF

Unit 3  |  Primary Sustainability Issues 64 Geothermal energy primarily comes from the heat produced from the decay of radioactive materials within the earth. This energy can be used to heat water and buildings, as well as to drive turbines for electricity production. Geothermal electricity is widely used in areas that are near tectonic plate boundar- ies, such as Iceland and the Philippines, where it is possible to access geothermal heat close to the surface. Even with low operational costs and high energy output, the capital cost of these systems is often difficult for homeowners to justify. However, at favorable sites, geothermal is an attractive option for utility-scale energy production. GEOTHERMAL ENERGY Energy derived from the heat stored within the Earth, typically near the edges of tectonic plates where heat can be captured at easier depths. WATCH & LEARN http://bit.ly/2qY3Uys Watch the video and respond to the questions below. 1. List four sources of nonrenewable energy. 2. List five sources of renewable energy. 3. Explain the most significant difference between renewable and nonrenewable energy sources from an ecological footprint standpoint. video: Advantages of Renewable Energy