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Humans have been capturing and using geothermal heat from the earth for a very long time. Geothermal energy was being used in China back in the 3rd Century BC and the Ancient Romans, of course, used it to heat their baths and their buildings. Now, in the 21st Century, geothermal power comprises a significant portion of the energy grid in countries ranging from the Philippines to Nicaragua. This week on Sea Change Radio, host Alex Wise talks with Karl Gawell, Executive Director of the Geothermal Energy Association, an organization that advocates for the expansion of geothermal for electricity production. He explains how geothermal works, tells us who the major players are in the industry, and talks about what needs to happen to move the United States toward fully embracing this ancient but largely untapped resource.