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The United Nations Intergovernmental Panel on Climate Change
and hundreds of other climatologists around the world came to such
conclusions years ago, but the difference now is the source: Muller is a
long-standing, colorful critic of prevailing climate science,
and the Berkeley project was heavily funded by the Charles Koch
Charitable Foundation, which, along with its libertarian petrochemical
billionaire founder Charles G. Koch, has a considerable history of
backing groups that deny climate change.
In an opinion piece in Saturday's New York Times titled "The Conversion of a Climate-Change Skeptic," Muller writes:
"Three years ago I identified problems in previous climate studies
that, in my mind, threw doubt on the very existence of global warming.
Last year, following an intensive research effort involving a dozen
scientists, I concluded that global warming was real and that the prior
estimates of the rate of warming were correct. I'm now going a step
further: Humans are almost entirely the cause."
The Berkeley
project's research has shown, Muller says, "that the average temperature
of the earth's land has risen by 21/2 degrees Fahrenheit over the past
250 years, including an increase of 11/2 degrees over the most recent 50
years. Moreover, it appears likely that essentially all of this
increase results from the human emission of greenhouse gases."
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