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Using geothermal energy

The Earth, which below the surface retains a relatively constant temperature, is the energy source behind geothermal systems. Energy can be tapped through a series of below-ground pipes, called loops, buried in the soil or submersed in a lake.

November 2, 2008


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Photos of the day

02.14.12 »

What happens when ordinary people decide to pay it forward? Extraordinary change. See how individuals are making a difference...

Charlie Weingarten pictured during a Common Threads cooking class in Los Angeles. The program, one of many projects started by Mr. Weingarten, aims to teach children to love healthy cooking and eating.

Charlie Weingarten finds fresh ways to champion selfless acts of philanthropy

A member of a philanthropic family founded Explore.org to inspire selflessness and lifelong learning.

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