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Amid charges of global warming hoax, new warning on climate change

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Still, "we felt that we needed to call attention of the delegates to the scientific case for urgent action," says Richard Somerville, professor emeritus at the Scripps Institution of Oceanography at the University of California, San Diego, a lead author of the IPCC's 2007 volume on climate science, and a contributor to this report. "If you want to stabilize the climate at a reasonable amount of global warming, then you cannot delay indefinitely."

The group's effort is independent of the UN-sponsored IPCC, which publishes reports on global warming roughly every five years, the last one in 2007. The Copenhagen Diagnosis aims to fill the gap on research since mid-2006 – the deadline for the 2007 IPCC report.

"There's new science and there's also three more years of data. In many instance, the observations show that climate change has accelerated," Dr. Somerville said in a briefing Tuesday on the report.

Controversy over hacked e-mails

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