In my last post, I discussed how the increasing risk of devastating heat waves—unlike the worsening of tornadoes—is definitely a phenomenon we can link to global warming. And now, as summer plods on, it’s time to begin paying attention to another one: the continuing decline of Arctic sea ice.
The extent of ice covering the Arctic has been declining for decades, and reached a record low in September of 2007, nearly 40 percent below its long term average. This wasn’t solely the product of global warming—weather patterns also have a lot to do with ice extent, and they contributed to the 2007 record.
Nevertheless, much like the worsening of heat waves, Arctic ice decline is one of the most obvious impacts of global warming—and this year, it’s possible that Arctic ice extent might reach a minimum even lower than it did in 2007.