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Last time CO2 hit 400 ppm, temperature was 8C warmer, seas 40m higher than today
2013-05-12 16:22:00| Climate Ark Climate Change & Global Warming Newsfeed
Guardian: Lake sediments recorded the climate of the Arctic during the last period when CO2 levels were as high as today The future of a globally warmed world has been revealed in a remote meteorite crater in Siberia, where lake sediments recorded the strikingly balmy climate of the Arctic during the last period when greenhouse gas levels were as high as today. Unchecked burning of fossil fuels has driven carbon dioxide to levels not seen for 3m years when, the sediments show, temperatures were 8C higher...
Carbon Dioxide Levels Surpass 400 PPM Levels For First Time
2013-05-12 16:18:00| Climate Ark Climate Change & Global Warming Newsfeed
RedOrbit: Atmospheric carbon dioxide levels have surpassed 400 parts per million (ppm) for the first time in human history, according to data released by the National Oceanic and Atmospheric Administration (NOAA). According to USA Todays Doyle Rice, NOAA data revealed on Friday the average CO2 levels at the Mauna Loa Observatory in Hawaii over the past five days were 400.03 ppm. Those readings are important because the Mauna Loa Observatory is the oldest continuous carbon dioxide (CO2) measurement...
A new world?: carbon dioxide concentrations in atmosphere hit 400 ppm
2013-05-11 18:10:00| Climate Ark Climate Change & Global Warming Newsfeed
Mongabay: For the first time since homo sapiens evolved, concentrations of carbon dioxide in the atmosphere have struck 400 parts per million (ppm) due to burning fossil fuels. The National Oceanic and Atmospheric Administration (NOAA) reports that readings of carbon dioxide at Mauna Loa Observatory in Hawaii hit the symbolic number on Thursday and are expected to continue rising in coming years. The last time concentrations were this high for a sustained period was 4-5 million years ago when sea levels were...
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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...
Carbon dioxide passes 400 ppm milestone, NOAA finds
2013-05-11 16:00:00| Climate Ark Climate Change & Global Warming Newsfeed
Climate Central: On May 9, the amount of carbon dioxide in the air exceeded 400 parts per million (ppm) for the first time in the observational record since 1958, and very likely for the first time in at least 800,000 years, the National Oceanic and Atmospheric Administration (NOAA) announced on Friday. This marks the first time the daily average CO2 concentration has risen past 400 ppm in the iconic record kept by the Mauna Loa Observatory in Hawaii, where daily observations go back to 1958, Climate scientists...
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