Natural climate changes can outweigh global warming from anthropogenic greenhouse gas emissions. In this May, 2008 New York Times article by Andrew Revkin, he refers to work done by researchers from the Leibniz Institute of Marine Sciences, in Kiel, Germany. "We're learning that internal climate variability is important and can mask the effects of human-induced global change," according to the lead author of a paper published in the May 1, 2008 journal Nature, Noel Keenlyside. This study looked at the relationship between currents in the Atlantic Ocean called the meridional overturning circulation, which undergo periodic changes, and global climate trends. The result of their computer simulation based on ocean temperatures indicate a slight cooling of Europe and North America in this coming decade.
Also, as pointed out in Revkin's article, researchers, including NASA scientists reported that a slowly fluctuating oscillation in Pacific Ocean temperatures had shifted into a cooling phase that is expected to exert an overall cooling of global climate.
Thursday, October 1, 2009
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From the end of the article, I thought the following added a perspective that should not be missed:
"It (modelling) should also help the public and policy makers understand that a cool phase does not mean the overall theory of human-driven warming is flawed, Dr. Trenberth said.
“Too many think global warming means monotonic relentless warming everywhere year after year,” Dr. Trenberth said. “It does not happen that way.”
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