Ice core borings in Antarctica have produced a record of historic carbon dioxide concentrations over the last 600,000 years. The borings show that the levels of carbon dioxide, a greenhouse gas, are at their highest ever because of the burning of fossil fuels, Mark Serreze, senior research scientist at the National Snow and Ice Data Center in Boulder, Colo.
Serreze said he was surprised to see a new lake, or polynya, the size of Maryland, opening up in the sea ice north of the Beaufort Sea.
In 20 years of looking at sea ice, he has never seen anything like it.
"If you asked me five years ago if it was human activity (causing global warming) versus natural variability, I was a fence-sitter,'' Serreze said.
"The magnitude of the changes is starting to rise above the noise of natural variability. There is a continuing trend. What we see in the Arctic is part of a much larger picture. We hate to say, 'We told you so.' But we told you so.''
Thursday, September 14, 2006
Even in the Winter, Arctic Ice is Melting
Scientist are very worried because it appears that Arctic ice is melting even in the winter: