the polar ice caps aren't melting at unprecidented rate
By what standard and over what time frame?
If you read his quote here
But projecting what the exact impacts will be over the 21st century remains very difficult. This is especially true when one asks how a local region will be affected.
A new five-year research plan presented this week by scientists and government officials meeting in Washington, D.C., asserts that people clearly are agents of environmental change, though it is still unclear how much human activity contributes.
Finally
Since 1979, the melt area has grown by 16 percent and is affecting higher and higher elevations.
Across the Arctic Ocean, the floating mantle of ice that covers it throughout much of the year shrank to record levels this summer, said Mark Serreze, also of the University of Colorado. In September, sea ice extent was 4 percent lower that that seen in any previous September since monitoring began in 1978.
Prove that these percentages of melt havent occurred before. Sea ice melt could be related a shift in warm water currents.
Co2 levels have been theorized to have been at much higher levels in the earths history. Life didnt end. Hi temps could mean higher humidity and water vapor trapped in the atmosphere. That could absorb the co2 bring to earth in rain and we could go into a rapid "cool down".
Anyway this is stupid issue that I care little about. As a matter of fact I work at an electric generating station that utilizes coal as a fuel source.
I will throw a couple of extra lumps on for yas.........