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Out of Africa and Into the American Midwest

Grasses bend in the wind, their golden tips tracing arcs across fields that stretch toward the horizon. Sunwashed by a fading evening light, these reedy ballet dancers are central figures in savanna, an ecosystem ...

Jan 09, 2012
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EU agency: air pollution costs exceed $134 billion

(AP) -- Air pollution isn't just harmful - it's expensive, resulting in health care and environmental costs of more than euro100 billion ($130 billion) in 2009, the European Union's environment agency said Thursday.

Nov 24, 2011
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Clean soot particle filters

The soot particle filters found on diesel vehicles are designed to ensure that no harmful particles make their way through the exhaust pipe. Often, though, the exhaust from newer-model engines is not hot enough ...

Oct 05, 2011
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