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3GPositive · 11-02-2008, 04:44 AM

Latest study says it's a done deal...

Selected quotes:

Attribution of polar warming to human influence : Abstract : Nature Geoscience

Attribution of polar warming to human influence
Nathan P. Gillett and others..
Nature Geoscience
Published online: 30 October 2008

The polar regions have long been expected to warm strongly as a result of
anthropogenic climate change, because of the positive feedbacks associated
with melting ice and snow, Several studies have noted a rise in Arctic
temperatures over recent decades but have not formally attributed the
changes to human influence, owing to sparse observations and large natural
variability. Both warming and cooling trends have been observed in
Antarctica, which the Intergovernmental Panel on Climate Change Fourth
Assessment Report concludes is the only continent where anthropogenic
temperature changes have not been detected so far, possibly as a result of
insufficient observational coverage. Here we use an up-to-date gridded data
set of land surface temperatures and simulations from four coupled climate
models to assess the causes of the observed polar temperature changes. We
find that the observed changes in Arctic and Antarctic temperatures are not
consistent with internal climate variability or natural climate drivers
alone, and are directly attributable to human influence. Our results
demonstrate that human activities have already caused significant warming in
both polar regions, with likely impacts on polar biology, indigenous
communities, ice-sheet mass balance and global sea level.

Study confirms human impact on climate - Breaking News - National - Breaking News

The study, from the Canadian Centre for Climate Analysis and published in
the journal Nature Geoscience, looked at the most up-to-date temperature
data from across both regions at the north and south poles and compared them
with temperatures simulated by four computer models. "We found that we could
only explain the warming that's been observed if we included human-climate
influences, particularly greenhouse gases," the study's author, Nathan
Gillett, told ABC Radio.

Climate change at the poles IS man-made - Climate Change, Environment - The Independent

It is the first time scientists have been able to prove the link between the
temperature changes in both polar regions are down to human activity and it
also undermines climate sceptics who believe the warming trend seen in the
Arctic in recent decades is part of the climate's natural variability.

"We're able for the first time to directly attribute warming in both the
Arctic and the Antarctic to human influences on the climate," said Nathan
Gillett of the Climate Research Unit at the University of East Anglia, who
led the study, published in the journal Nature Geoscience.

11-02-2008, 04:44 AM	#4 (permalink)
3GPositive Upright	Latest study says it's a done deal... Selected quotes: Attribution of polar warming to human influence : Abstract : Nature Geoscience Attribution of polar warming to human influence Nathan P. Gillett and others.. Nature Geoscience Published online: 30 October 2008 The polar regions have long been expected to warm strongly as a result of anthropogenic climate change, because of the positive feedbacks associated with melting ice and snow, Several studies have noted a rise in Arctic temperatures over recent decades but have not formally attributed the changes to human influence, owing to sparse observations and large natural variability. Both warming and cooling trends have been observed in Antarctica, which the Intergovernmental Panel on Climate Change Fourth Assessment Report concludes is the only continent where anthropogenic temperature changes have not been detected so far, possibly as a result of insufficient observational coverage. Here we use an up-to-date gridded data set of land surface temperatures and simulations from four coupled climate models to assess the causes of the observed polar temperature changes. We find that the observed changes in Arctic and Antarctic temperatures are not consistent with internal climate variability or natural climate drivers alone, and are directly attributable to human influence. Our results demonstrate that human activities have already caused significant warming in both polar regions, with likely impacts on polar biology, indigenous communities, ice-sheet mass balance and global sea level. Study confirms human impact on climate - Breaking News - National - Breaking News The study, from the Canadian Centre for Climate Analysis and published in the journal Nature Geoscience, looked at the most up-to-date temperature data from across both regions at the north and south poles and compared them with temperatures simulated by four computer models. "We found that we could only explain the warming that's been observed if we included human-climate influences, particularly greenhouse gases," the study's author, Nathan Gillett, told ABC Radio. Climate change at the poles IS man-made - Climate Change, Environment - The Independent It is the first time scientists have been able to prove the link between the temperature changes in both polar regions are down to human activity and it also undermines climate sceptics who believe the warming trend seen in the Arctic in recent decades is part of the climate's natural variability. "We're able for the first time to directly attribute warming in both the Arctic and the Antarctic to human influences on the climate," said Nathan Gillett of the Climate Research Unit at the University of East Anglia, who led the study, published in the journal Nature Geoscience.