Once upon a time the estimated effects of a doubling of CO2 where as high as 6C.
Climate science says:
CO2 was about 280ppm in 1750.
CO2 is about 404ppm now.
CO2 levels have been rising by about 2ppm since 1997.
Therefore a doubling of CO2 from 1750 will occur around 78 years from now – say 2100.
The Transient Climate Response to a doubling of CO2 is around 1.35C.
Therefore temperatures from 1750 to 2100 will have risen by 1.35C
And for temperature to rise another 1.35C CO2 will have to go from 560ppm to 1120ppm – 280 more years 2380.
I don’t know about you, but 2.7C by 2380 sounds pretty nice.
And remember, for temperatures to go up 1.35C from today, it will take 200 years.
Whats everybody worrying about?
(h/t Hockey Schtick)