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Ice-free arctic in Pliocene, last time CO2 levels above 400 ppm
2013-05-11 16:00:00| Climate Ark Climate Change & Global Warming Newsfeed
ClimateWire: Scientists trying to determine how the Earth might change as temperatures rise often look back in time to a period around 3.6 million years ago called the middle Pliocene, when concentrations of carbon dioxide ranged from about 380 to 450 parts per million. (Today they are nearing 400.) A study published yesterday in the journal Science analyzed the longest land-based sediment core ever taken in the Arctic and found that during this period, from 3.6 million to 2.2 million years ago, the area around...
CO2 levels in atmosphere hit historic high
2013-05-11 16:00:00| Climate Ark Climate Change & Global Warming Newsfeed
Australian Broadcasting Corporation: Global greenhouse gases in the atmosphere have reached an ominous milestone that's unprecedented in recorded human history. At the Mauna Loa observatory in Hawaii, the daily reading of carbon concentrations has now reached a level that hasn't been seen in more than 3 million years: CO2 levels in the atmosphere have hit 400 parts per million. The last time it reached a level like this, temperatures rose from between three and four degrees and sea levels were between five and 40 metres higher...
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Carbon dioxide reaches levels never seen by humans
2013-05-11 12:16:00| Climate Ark Climate Change & Global Warming Newsfeed
Greenpeace: The levels of the carbon dioxide in the atmosphere has reached 400 parts per million for the first time in human history. The last time levels were this high global average temperatures eventually reached 3 or 4C° higher than now, the polar regions were up to 10C° warmer than today the Greenland and Antarctic ice sheets were smaller and Sea level ranged between five and 40 meters (16 to 131 feet) higher than today. There are two reasons to be seriously worried by this year's CO2 measurements...
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Call for action over CO2 levels
2013-05-11 09:52:00| Climate Ark Climate Change & Global Warming Newsfeed
BBC: Scientists are calling on world leaders to take action on climate change after carbon dioxide levels in the atmosphere broke through a symbolic threshold. Daily CO2 readings at a US government agency lab on Hawaii have topped 400 parts per million for the first time. Sir Brian Hoskins, the head of climate change at the UK-based Royal Society, said the figure should "jolt governments into action". China and the US have made a commitment to co-operate on clean technology. But BBC environment...
CO2 levels hit new peak at key observatory
2013-05-10 19:57:00| Climate Ark Climate Change & Global Warming Newsfeed
CNN: In some ways, it's just a number, but it's a big number with enormous implications. For the first time, scientists measured an average concentration of atmospheric carbon dioxide of 400 parts per million in Mauna Loa, Hawaii, where the National Oceanic and Atmospheric Administration observatory is located, on Thursday. "Most experts that really study CO2 amounts estimate that we haven't seen that amount of CO2 in our atmosphere in about 3 million years," said J. Marshall Shepherd, climate change...
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