Billy_Bob
Diamond Member
How about a thousand years;
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Figure 6: Composite Northern Hemisphere land and land plus ocean temperaturereconstructions and estimated 95% confidence intervals. Shown for comparison are published Northern Hemisphere reconstructions (Mann 2008).
Paleoclimatology draws upon a range of proxies and methodologies to calculate past temperatures. This allows independent confirmation of the basic hockey stick result: that the past few decades are the hottest in the past 1,300 years.
What evidence is there for the hockey stick
As you can see, the temperatures were declining until the beginning of the industrial revolution. At which point we starting burning fossil fuels in large amounts, and increased the amount of CO2 in the atmosphere by more than 40%, the amount of CH4 by more than 250%. And you have more than 100 years of rising tempertures there.
OMG... still citing MANN as a reliable source.... this has been shown fraud so many times.... AND YOU KNOW IT!! Quit lying you ignorant fool.