Slide 7 of 24
Notes:
This figure, taken from the IPCC report, compares the instrumental record of northern hemisphere temperature (red) with temperature reconstructed using data from tree rings and other “proxy” data. Viewed in this context, the warming of the 20th century appears to be well outside the natural range of variability – indeed, the IPCC said that the 20th century warming is “likely [judged 66-90% chance of being true] to have been the largest of any century during the past 1,000 years.”
