Humans have been warming the Earth's climate for the last 10,000 years, US scientist William Ruddiman claims.
Figure 1-2 Climate of the last 2400 years
Hmmm! strange definition of warming trend by humans there. Looks like overall down to me.
Figure 1-3 Climate of the last 12,000 years
Ohh! I see, It must-a-been that jump in temperature just before agriculture set in from all them caveman hunter/gatherer campfires.
Regarding Figure 1-3, it never ceases to amaze me that trained scientists will publish data like the chart you included. Are they really suggesting that they have the ability to measure temperature via tree rings, ice cores, etc. to an accuracy any where close to 1 degree Celsius?
In a past life I had the mind-numbing task of calibrating thermometers (ISO 9000), the only diversion provided was the shock I experienced when I realized how many "scientific" thermometers were not capable of +/-1 degree accuracy.
If Mr. Ruddiman was at all honest he would concede that his 1 degree estimate has a fair amount of inaccuracy associated with it (maybe 5 degrees or more) so in reality his conclusions are meaningless.