2010 was near .545c, which is the baseline. So you get .2c from 2000-2010 warm up over the 1990's, so you would expect .74c for 2020 "baseline". IF global temperatures work in a linear way and worked like the first decade. BUT considering that this decade WON"T have 2002-2007, which was more or less neutral and without huge nina's forcing the avg up and we are likely in a more nina like pattern I'd say .7c for 2020 within a neutral year(NO NINA or Nino). I'm not saying MAN is causing it or co2 for that matter, but we do appear to be within a time that our planet is warming for some reason. It of course could be entirely natural like the roman or med evil warm periods, but we are within such a period now and I thought it would be interesting to hear your opinion on 2020. The baseline is more or less the avg of the nina and nino's and other patterns that cause up and downs. In the graph of the giss data this is shown. I believe the reason why the temperature seemed to warm faster in the 1994-2000 period is because of the massive volcano that went off in 1991. I believe it caused the global temperature to drop about -.1c, but we quickly rebounded and warmed near as quick as it would of. That is why the 1990's appear so much faster warming up then the 2000's.