New study: could the sun have warmed the world? February 10, 2010Posted by honestclimate in Discussions.
Tags: climate change, global warming
New study: could the sun have warmed the world?
Herald Sun, February 10, 2010
Yet another paper questioning the theory that man is behind the warming of the earth over the past half-century:
The notion that scientists understand how changes in Earth’s orbit affect climate well enough for estimating long-term natural climate trends that underlie any anthropogenic climate change is challenged by findings just published.
The new research was conducted by a team led by Professor Eelco Rohling of the University of Southampton’s School of Ocean and Earth Science hosted at the National Oceanography Centre, Southampton…
According to the ‘anthropogenic hypothesis’, long-term climate impacts of man’s deforestation activities and early methane and carbon dioxide emissions have artificially held us in warm interglacial conditions, which have persisted since the end of the Pleistocene, about 11,400 years ago….
The researchers found that the current interglacial has indeed lasted some 2.0-2.5 millennia longer than predicted by the currently dominant theory for the way in which orbital changes control the ice-age cycles. This theory is based on the intensity of solar radiation reaching the Earth at latitude 65 degrees North on 21 June, the northern hemisphere Summer solstice.
But the anomaly vanished when the researchers considered a rival theory, which looks at the amount of solar energy reaching the Earth the same latitude during the summer months. Under this theory, sea levels could remain high for another two thousand years or so, even without greenhouse warming.
“Future research should more precisely narrow down the influence of orbital changes on climate,” said Rohling: “… And that is essential for a better understanding of any potential long-term impacts on climate due to man’s activities.”
Why is Rohling’s research interesting? Because the IPCC’s argument that man’s gases have caused most of the post-war warming is based not on proof that those gases did indeed do that, but on an inability to think of any other cause. Rohling suggests he may just have found that alternative explanation, or part of it.
And, he adds, our long-tern future looks chilly.