Argument: Geothermal replaces oil-heating; helps reduces greenhouse emissions
"A CLEAN ENERGY FUTURE FOR THE UNITED STATES: THE CASE OF GEOTHERMAL POWER". Testimony by the President of Iceland Olafur Ragnar Grimsson at a Senate Hearing Committee on Energy and Natural Resources". US Senate. 26 Sept. 2007 - "Assuming that geothermal energy used for heating homes in 2003 [in Iceland] was equivalent to the heat obtained from the burning of 646,000 tons of oil, the use of geothermal energy reduced the total release of CO2 in the country by roughly 37%."