Based on a World Bank study discussed here, over the past 150 years, natural influences on global temperature have remained consistently between -0.5° and +0.5°F. In effect, a few years up and a few years down, but never varying much.
The human influence had an even smaller variation, -0.2° and +0.2°F, through the 1920s.
From the 1930s to 1960s, the human influence did not have a negative year, staying between +0.2° and +0.4°F.
Since the 1960s, however, the human influence has steadily grown, to +1.4°F around 2010.
With the human influence so significant, if the natural influence has an ‘up’ year, like it has had from 2000 – 2010 (possibly impacted by human influence) the combination of the two puts us over the +2.0°F threshold that science is telling us will be painful for all of us.
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