US Democratic presidential nominee Senator Obama and Senator Clinton wave
| By Reuters
US Democratic presidential nominee Senator Barack Obama (D-IL) and Senator Hillary Clinton (D-NY) wave at a campaign rally in Orlando, Florida, October 20, 2008. REUTERS/Jim Young
Ranking of the World's Most Polluted Cities
We live in a world where economic growth and a healthy environment are often at odds with each other. This truth can be seen in the smokestacks of coal power ...
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