I’m not understanding your math here, hopefully you (or anyone with a better grasp of logarithms…

Jere Krischel

1

What I’ve done is take the base-1.25 logarithm of 2 — because CO2 increased 25% from 1950 to 2010 — which is 3.106. It can also be computed as log(2)/log(1.25). Note that 1.25 raised to the 3.106 power is 2 (doubling).

Please see the full explanation under the heading “The Mainstream Scientific Case”.