This year, the sea ice around Antarctica grew to its largest extent since satellite observation began in 1979—whereas the Arctic arrived at record minimum—meaning present climate change is a far different scenario. In fact, the Milankovitch cycles would predict gradual global cooling. Man-made greenhouse gases, primarily CO2, are unequivocally driving present-day warming, according to the Intergovernmental Panel on Climate Change. "This kind of study discusses the natural cycle and could help define the likely positive feedbacks we can expect in the long-term future, [for example] as temperatures warm, the ocean will want to give up more CO2, or rather absorb less," says climatologist Gavin Schmidt of NASA's Goddard Institute of Space Studies. "But it has no direct impact on attribution of 20th century warming."*
More evidence that this is anomalous with natural warming and our influence is an unatural imbalance. Correcting this is the challenge of our liftimes and many to come.
Labels: Global Warming