U.N. draft bolsters human link to warming
Scientists are more convinced that human activity is behind the increase in global temperatures since the 1950s, which has boosted sea levels and the odds of extreme storms, according to a leaked draft of an upcoming U.N. report.
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#1 Aug 21, 2013
A good review for anyone. Taken from it:
Marshall Shepherd, a research meteorologist at the University of Georgia and the president of the American Meteorological Society, said the report is expected "to strongly identify the significant human impact on the climate system."
"There are certainly some uncertainties that should be acknowledged, but the consensus is very clear that humans are playing a significant role," said Shepherd, who contributed to the 2007 report but was not involved in compiling the upcoming document.
Increasing concentrations of carbon dioxide and other emissions have driven up global average temperatures by about 0.6 degrees C (1 degree F) since 1950, the report states. That's likely to go up by between 1 and 3.7 degrees C (1.8 to 6.6 F) by 2100, the draft states.
Meanwhile, the rise of sea levels, currently about 3 mm (1/8 inch) per year, is "very likely" to speed up. Global average sea levels are expected to go up between 50 and 97 cm -- 20 inches to more than 3 feet -- by 2100, according to the draft.
"Emissions at or above current rates would induce changes in all components in the climate system, some of which would very likely be unprecedented in hundreds to thousands of years," it states. Those changes are likely to occur "in all regions of the globe" and affect the water cycle, rising ocean acidity and changes in the water cycle.
"Many of these changes would persist for many centuries," it added.
The effect has already been seen in shrinking summer icepacks in the Arctic Ocean and warming permafrost in the Northern Hemisphere, it states.
"It is very likely that the Arctic sea ice cover will continue to shrink and thin and that Northern Hemisphere snow cover will decrease during the 21st century as global temperature rises," the draft states.
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