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.
Now in its 43rd year, Earth Day has become an international day dedicated to promoting environmental awareness and action. Lester Brown explains what's changed, as concern about climate change and green energy have come to the forefront of the movement.