Ars Technica: Earths climate system is a complex beast. In order to discuss it, we often rely on simple measures like climate sensitivity--an estimate of how much warming we can expect to get from a given increase in greenhouse gas concentrations. Unfortunately, measuring the climate sensitivity isnt that simple. Among other complications, you have to pick the timeframe youre interested in. The climate system is sluggish in some ways, so the longer you give it to respond, the greater its response will be. ...