Revkin actually seems to believe that after billions of years, Arctic climatic cycles have now officially ended

Video Update on Tussle Over Allegedly Unfreezing Arctic - Dot Earth Blog - NYTimes.com

Even as the United States and other countries explore ways to cut emissions of greenhouse gases linked to global warming, some warming is already locked in, the latest big studies have firmly concluded. This means the Arctic of our imagination and history books truly is history. Watch this space for more.