Cambridge Ocean Physics professor Peter Wadhams happens as the Arctic ice cap shrinks and disappears.
Few people understand that the Arctic sea ice “death spiral” represents more than just a major ecological upheaval in the world’s Far North. The decline of Arctic sea ice also has profound global climatic effects, or feedbacks, that are already intensifying global warming and have the potential to destabilize the climate system. Indeed, we are not far from the moment when the feedbacks themselves will be driving the change every bit as much as our continuing emission of billions of tons of carbon dioxide annually.
So what are these feedbacks, and how do they interact? The most basic stem from turning the Arctic Ocean from white to blue, which changes the region’s albedo — the amount of solar radiation reflected off a surface. Sea ice, in summer, reflects roughly 50 percent of incoming radiation back into space. Its replacement with open water — which reflects roughly 10 percent of incoming solar radiation — is causing a high albedo-driven warming across the Arctic.
When covered almost entirely by ice in summer — which the Arctic was for tens of thousands of years — water temperatures there didn’t generally rise above freezing. Now, as the open Arctic Ocean absorbs huge amounts of solar radiation in summer, water temperatures are climbing by several degrees Fahrenheit, with some areas showing increases of 7 degrees F above the long-term average.
Such changes mean that a system that was once a vast air conditioner has started to turn into a heater. Just how much extra heat are the dark waters of Arctic Ocean in summer adding to the planet? One recent study estimates that it’s equivalent to adding another 25 percent to global greenhouse emissions.
I can't agree with carbon removal - certainly not yet. It is far too expensive. On the other hand we may have gone too far.