Comment Re:How come... (Score 5, Insightful) 655
And of course, we understand the mechanism.
Are you sure? The last glacial maximum was between 19-25000 years ago (http://en.wikipedia.org/wiki/Last_Glacial_Maximum) during which time vast portions of North America and Europe were covered in ice sheets.
19,000 years is a pretty short period of time in the grand scheme of things. To think the location I'm currently living was underneath a kilometer of ice less than 20,000 years ago, and no there are no glaciers anywhere close, the logical conclusion is the earth has been warming up for a lot longer than just the time since the industrial age. In fact, from what I understand about earth's history, we've been a majorly tropical planet for most of the time and ice cover is somewhat rare.
There's no doubt we have some effect on the changing climate (in regards to temperature via the greenhouse effect), but to say that is the mechanism causing the earth to warm seems like a huge jump from basic logic.