One can reasonably question if climate changes can be reasonably measured over a 150 year time frame. At a geological scale climate change has been ongoing for

One can reasonably question if climate changes can be reasonably measured over a 150 year time frame. At a geological scale climate change has been ongoing for about 4 and a half billion years. Saying that the latest .3333x10^(-6)% of that data stream is sufficient to deduce a new trend is pretty amazing if true. On the other hand processes like glaciation and desertification can happen with alarming rapidity. Supposedly the former can occur in less than a year http://www.dailymail.co.uk/sciencetech/article-1227990/Ice-Age-took-just-SIX-months-arrive--10-years.html http://www.dailymail.co.uk/sciencetech/article-1227990/Ice-A.... Those are two kinds of climate change that I consider cause for concern. The dust bowl was a big deal. And then there are things like super volcano eruptions.