That project is already causing a stir in the climate community. In an article just published in the journal Science Express, Dahl-Jensen’s team wrote about how it had discovered from the ice cores that the atmospheric circulation in the Northern Hemisphere over Greenland “changed abruptly” just as the last ice age ended around 11,700 years ago.
It seems to have been driven by a sudden change in monsoons in the tropics. The change was so abrupt that it warmed the Northern Hemisphere over Greenland by 10 degrees Celsius in just 50 years — a dramatic increase.
“It shows that our climate system has the ability to make very abrupt changes all by itself,” said Dahl-Jensen.
Some climate-change deniers would say that this proves that mankind is not important in changing the climate. Climate change experts, like Dahl-Jensen, say it’s not so simple: The climate is always changing, sometimes very abruptly, so the last thing that mankind should be doing is adding its own forcing actions — like pumping unprecedented amounts of greenhouse gases into the atmosphere. Because you never know — you never know — what will tip the balance and send us hurdling into another abrupt change ... and into another era.
Last week, the Times' official worrywart, Paul Krugman acknowledged that we can't be sure how bad the effects [if any -ed] of global warming might be, but do we want to take the chance?.
This is all heartening news to some of us. Al Gore claimed that "the dispute is over". People like me were called Holocaust deniers and worse. Now, it seems, that judgement may have been a bit premature. Better yet, I'm now justified in postponing yet again my first viewing of "An Inconvenient Truth".
Nalgene water bottles