“About 250 billion tons of ice per year has been lost from the Greenland ice sheet over the last five to ten years and that is accelerating as well. If these jet stream changes prevail, it is likely to accelerate further over the next few decades.”
- Edward Hanna, Ph.D., Prof. of Geography, U. K.'s Sheffield University
June 27, 2013 Sheffield, South Yorkshire, England - Back in the 1980s, scientists said the upper safety limit for atmospheric CO2 was 350 parts per million (ppm). But as early as 1988, atmospheric CO2 levels went higher than 350 ppm. So the next safety limit was set at 400 ppm.
We're there now! NOAA and the Scripps Institution of Oceanography website, CO2now.org, has a graphic summary of CO2 concentration increases in the Earth's atmosphere since May 2011. Then it was 394.29 parts per million (ppm). The next year in May 2012, it was 396.87 ppm. And then a month ago in May 2013, it was 399.89 ppm and climbing.
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