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Top climate scientists say global warming caused primarily by humans

Updated: Friday, September 27 2013, 01:36 PM CDT
From the New York Times.

STOCKHOLM The worlds top climate scientists on Friday formally embraced an upper limit on greenhouse gases for the first time, establishing a target level at which humanity must stop spewing them into the atmosphere or face irreversible and potentially catastrophic climatic changes. They warned that the target is likely to be exceeded in a matter of decades unless steps are taken soon to reduce emissions.

Articles in this series focus on the central arguments in the climate debate and examine the evidence for global warming and its consequences.

Unveiling the latest United Nations assessment of climate science, the experts cited a litany of changes that are already under way, warned that they are likely to accelerate and expressed virtual certainty that human activity is the main cause.

Climate change is the greatest challenge of our time, said Thomas F. Stocker, co-chairman of the Intergovernmental Panel on Climate Change, the United Nations-sponsored group of scientists that produced the report. In short, it threatens our planet, our only home.

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