Counteracting Global Warming

Carbon dioxide is the main chemical element that influences global warming, in that it virtually "traps" heat moving away from the surface of the planet and redirects it downwards, creating a greenhouse effect of sorts. And since this has been common knowledge for some time now, scientists ha... [ read more >> ]

The Chinese capital Beijing is one of the most polluted cities in the world. It's covered all the time by a thick layer of smog.

Image comment: The Chinese capital Beijing is one of the most polluted cities in the world. It's covered all the time by a thick layer of smog.
Image credits: Kevin Dooley / Flickr

The Chinese capital Beijing is one of the most polluted cities in the world. It's covered all the time by a thick layer of smog.
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