This actually supports the effects of CO2 levels on the earths temperature. It indicates how the climate is highly sensitive to the greenhouse warming that we're now causing.
Gosh - I thought the total opposite from that graph and debunked (for reason I said above).
Just goes to show that two different people, looking at the same information, see two different results.
My first impression was something dramatic occured around 1300 ... when the vikings discovered Canada ... as there was a seriously dramatic plunge in temperatures. Way before humans were more than a dot on the landscape and certainly not burning fossil fuels other than a wee bit 'o peat.
Secondly - real and accurate temperature recording have only been available for the last 150 or so years, and the precise measurements on the graph reflects that with dips and peaks - whereas, over milleniums in time, these dips and peaks would show up on "guestimates" as a more even distribution.
Thirdly - the major burning of fossil fuels didn't occur until the mid/end of the 1900's but still on a minor level with the industrial revolution in Europe ... and population didn't start to increase dramatically until around 1920/30 ... and scientists are saying that it then takes many decades for this burning to affect temperatures - yet temperatures have been shown as fluctuating wildly since accurate measurements were available.
This tells me that it was more the ability to take true, short period measurements, rather than relying on random core samples, that is the basis for claiming climate change.
If anything, for me it debunks the claims of human induced change ... although ... I do believe that we do have some affect, that the world is overpopulated and that we need to be more accountable and sustainable.
Unfortunately, those with the intellect, ability and resources to do such are in the minority. The majority (and, yes, I am being general here) who are the ones that are breeding en masse either don't have the intellect, the ability or the resources.
Now - where was that 10acre farm and that straw mud house I was looking at?