The Climate Control Knob September 17 United Nation’s Intergovernmental Panel on Climate Change most recent assessment report attributes all of the roughly 1.0 ᵒC temperature rise since 1850, the end of the Little Ice Age, human generated greenhouse gas emissions. Here’s what they say: “The likely range of total human caused global surface temperature increase from1850–1900 to 2010—2019 is 0.8 ᵒ C to 1.3 ᵒC, with a best estimate of 1.07ᵒC. It is likely that well-mixed GHGs (greenhouse gasses) contributed a warming of 1.0ᵒC to 2.0ᵒC, other human drivers (principally aerosols) contributed to a cooling of 0.0ᵒC to 0.8ᵒC, natural drivers changed global surface temperatures by -0.1ᵒC to 0.1ᵒC, and internal variability changed it by -0.2ᵒC to 0.2ᵒC.” What’s more they’ve pinned the “best estimate” of equilibrium climate sensitivity to a doubling of atmospheric CO 2 at 3.0ᵒ C. “Based on multiple lines of evidence, the very likely range of equilibrium clim...
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