I agree, they are not doing climate science. Instead, they are equating changes in global climate over time with differences in local climate in space and then

I agree, they are not doing climate science. Instead, they are equating changes in global climate over time with differences in local climate in space and then extrapolating that "simplifying assumption" into absurd conclusions, such as that a 5 degree increase in the average temperature of the globe would only reduce global GDP by 5 percent.