CO2 Questionnaire Thread 2

[BornFromTheVoid]

Two years ago, a few polls were posted about CO2 and climate sensitivity, and there were 26 or so responses. The old poll can be seen here.

So I thought, seen as some time has passed, to post up the same questions and see how things have changed, if at all.

Like last time, voting is set to private.

[BornFromTheVoid]

Average guess for equilibrium sensitivity is 2.5C so far (but only 7 votes), with warming from doubling CO2 alone being 1.4C

[iapennell]

Now with 23 votes average for equilibrium sensitivity is nearer 3C with warming from doubling alone around 1.5C. It will be interesting to see how the Sun going into a Maunder Minimum-type quiet phase and possible volcanic eruptions over the next twenty years impact on the predicted global mean temperatures due to rising CO₂ levels, should these do so.  

[Lettucing Gutted]

Damn, this poll was closed before I got a chance to vote!  My answers would have been as follows:-

1)  Yes I believe that CO2 is a Greenhouse Gas, capable of producing a warming effect.

2)  All other feedbacks excluded, I expect a temperature increase of >2.5C (3C best case and 5C worst case) from a doubling of atmospheric CO2 concentration alone.

3)  Including all other feedbacks on top of a doubling of C02 I expect a global temperature increase of >6.5C (probably in the region of 20C give or take 2C if the worst possible scenarios happen).

Edited August 2, 2016 by Lettucing Gutted