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Posted Thu Apr 25 2013: from
RTCC:
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CO2 level nears 400ppm climate milestone http://apocadocs.com/s.pl?1366852512
Global atmospheric CO2 concentration is edging towards the 400 parts per million (ppm) mark for the first time in millions of years.
That's the expectation of scientists at the Mauna Loa recording station in Hawaii, widely regarded as the most reliable record of atmospheric CO2....
The annual peak is in May just before summer plant growth sucks more CO2 out of the atmosphere. Levels have risen every year since recording began.
Scripps estimates that the 400ppm mark could be breached this year and if not, it will definitely be broken in 2014. These levels were last sustained 3.2-5 million years ago when temperatures were 2-3 degrees C warmer.
"I wish it weren't true, but it looks like the world is going to blow through the 400ppm level without losing a beat," said Scripps geophysicist Ralph Keeling, whose father Dave established the network of remote CO2 monitoring. "At this pace we'll hit 450ppm within a few decades," said Ralph Keeling.
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[Read more stories about:
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