"The transition from coal, oil, and gas to wind, solar, and geothermal energy is well under way. In the old economy, energy was produced by burning something -- oil, coal, or natural gas -- leading to the carbon emissions that have come to define our economy. The new energy economy harnesses the energy in wind, the energy coming from the sun, and heat from within the earth itself."

Source : "Plan B 4.0: Mobilizing to Save Civilization". Book by Lester R. Brown, October 5, 2009.

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