I have seen several articles showing that the most recent trend appears to be cooling! (Of course, without a lot more study, these are no more certain than warming. What we need is more study, not more panicking.) I will look them up and post links as I find them. There was also the correction to NASA data that removed most of the warming trend (which, of course, did not receive the publicity the original data did). For info on previous warm periods, it is a historical fact that the Vikings grew grapes in Greenland! Must have been quite a bit warmer, and if so, where were all the horrible disasters that are being predicted now?