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| Polar Year Explores How Earth Systems Interact |
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April 1, 2008
In-depth Coverage
The poles help keep the planet cool and contain much of the Earth's fresh water locked up in ice sheets. But little is known about these remote regions. Scientists are hoping to change that during a two-year intensive period of study involving more than 60 nations.
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| Water Recycling |
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| Green City |
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| Pittsburgh Reinvented as Clean Power Hub |
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April 25, 2008
Report
A century after its heyday as a center of the industrial revolution, Pittsburgh is trying to remake itself as a center of the "green" revolution. The city is home to researchers and businesses working to replace oil and coal with solar, wind and nuclear power.
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| Climate Change |
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| Carbon Trading |
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