Researchers use a floating platform to take sediment cores from Sunday Lake in southwestern Alaska. Darrell Kaufman/Northern Arizona UniversityFrom The New York Times:
The human-driven buildup of heat-trapping greenhouse gases in the atmosphere appears to have ended a millenniums-long slide toward cooler summer temperatures in the Arctic, the authors of a new study report.
Scientists familiar with the work, to be published Friday in the journal Science, said it provides fresh evidence that human activity is not only warming the globe, particularly the Arctic, but could even fend off what had been presumed to be an inevitable descent into a new ice age over the next several dozen millenniums.
The reversal of the slow cooling trend in the Arctic, recorded in samples of layered lakebed mud, glacial ice and tree rings from Alaska to Siberia, has been swift and pronounced, the team writes.
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More Climate Change News
Arctic reverses trend, is warmest in two millennia -- AP
Arctic now warmest in 2000 years, researchers say -- Reuters
Human Activity Blamed in Reversal of Cooling in Arctic -- Washington Post
Next Ice Age Delayed by Global Warming, Study Says -- National Geographic
Arctic Temperatures Are Warmest in 2,000 Years -- Live Science
Recent Arctic warming follows centuries of natural cooling -- CBC
Arctic ice reveals last decade was hottest in 2,000 years -- Daily Mail
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SOME species of Australian birds are shrinking and the trend will likely continue because of global warming, a scientist said.
Janet Gardner, an Australian National University biologist, led a team of scientists who measured museum specimens to plot the decline in size of eight species of Australian birds over the past century.
The research, published last week in the British journal Proceedings of the Royal Society B: Biological Sciences, found the birds in Australia’s southeast had become between 2 per cent to 4 per cent smaller.
Over the same century, Australia’s average daily temperature rose 1.3 degrees Fahrenheit (0.7 deg C), with the sharpest increase since the 1950s.
Source:- http://lifeofearth.org/2009/08/global-warming-shrinks-birds.html
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