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.
Lester Brown's World on the Edge: How to Prevent Environmental and Economic Collapse in Karen Zeitvogel's article "World is 'one poor harvest' from chaos, new book warns," for AFP. Posted January 17, 2011.