Did you know? The heat in the upper six miles of the earth’s crust contains 50,000 times much as energy as found in all the world’s oil and gas reserves combined. Despite this abundance, only 10,500 megawatts of geothermal generating capacity have been harnessed worldwide. For more information view the text and data in Chapter 5 of Plan B 4.0: Mobilizing to Save Civilization.
Minnesota Public Radio podcast, "Environmentalist Lester Brown Lays Out His Plan for Saving the Planet," of Brown's presentation at the University of Minnesota on Monday, November 16, 2009. Broadcast November 17, 2009.