Analysis by Physicist Dr. Denis Rancourt: ‘A large increase (doubling or ten-fold) in CO2, in addition to the small present amount, does not significantly change the global surface temperature’

‘For example, by analogy, a small amount of a very toxic substance can kill you but doubling the lethal dose will not kill you more. That’s saturation. Likewise, the “logic” that a large increase must have a large effect because it is a large relative change in concentration is wrong.’