At the end of their chat about global warming the other day, Andrew Neil asked James Delingpole and Andrew Pendleton of FOE to send him their understandings of global temperature changes since the end of the last century. The responses have now been posted at Neil's blog.
I'm not sure they leave us any the wiser. The problem (well, one of the problems) with discussing statistical significance is that you have to have a model for what the climate does normally. Since nobody knows what model should be used, it's not clear to me that we can say anything very much about the significance of the changes in temperature in the last decades or the last hundred years.