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GREENHOUSE GAS LEVEL HITS MILESTONE AS CO2 LEVEL SET RECORD

WASHINGTON, U.S.A. -  Worldwide levels of the chief greenhouse gas that causes global warming have hit a milestone, reaching an amount never before encountered by humans, federal scientists said.
Carbon dioxide was measured at 400 parts per million at the oldest monitoring station which is in Hawaii sets the global benchmark. The last time the worldwide carbon level was probably that high was about 2 million years ago, Pieter Tans of the National Oceanic and Atmospheric Administration said on Friday.
That was during the Pleistocene Era. “It was much warmer than it is today,” Tans said. “There were forests in Greenland. Sea level was higher, between 10 and 20 metres.”
Other scientists say it may have been 10 million years ago that Earth last encountered this much carbon dioxide in the atmosphere. The first modern humans only appeared in Africa about 200,000 years ago.
 The measurement was recorded Thursday and it is only a daily figure, the monthly and yearly average will be smaller. The number 400 has been anticipated by climate scientists and environmental activists for years as a notable indicator, in part because it’s a round number — not because any changes in man-made global warming happen by reaching it.

Source: Yahoo News...More
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