There are many good reasons to question the "lukewarmer" implication that CO2 controls the climate, but is not dangerous.
Here's my quick summary:
(1)
In 4.5 billion years of climate history, we have ice core evidence that CO2 levels lagged average temperature in the past 800,000 years, and for real-time measurements there is only one brief period of strong positive correlation:
From the 1993 low to the 2003 high, the average temperature anomaly rose by at least +0.5 degrees C., and so far has remained in a higher range than before 1993 (I'm using satellite data). Other people would stretch out the "1993 to 2003" period, and say "1975 to 2000".
(2)
Are we supposed to believe "the climate controller"
has switched at least three times since 1940,
with no explanation of how that could happen,
why it happened, and no evidence in the temperature record that anything unusual happened?
Below is what I hear from "modern climate science",
and it seems so ridiculous that I added (h)
for even more laughs!
(a) Natural climate change for 4.5 billion years,
(b) 1940: Natural climate change "dies",
(c) 1940: Man made aerosols take over as "the climate controller",
(d) 1975: Man made aerosols "die",
(e) 1975: Man made CO2 takes over as "the climate controller",
(f) 2000: Man made CO2 "falls asleep"
(g) 2015 / 2016: ENSO "El Nino" takes over as "the climate controller"
(h) 2017: In late 2017 there will be an election
for "The New Climate Controller".
The four candidates in 2017, so far:
-- Al "The Blimp" Gore,
-- Barack "The Seas Will Stop Rising" Obama.
-- The "Rope-a-Dope" Pope
-- Michael "Hockey Stick" Mann
(Mann claims experience in controlling climate history!)
(3) In the “era of manmade CO2” since 1940, we had:
(a) Negative correlation of CO2 and temperature
from 1940 to 1975,
(b) Positive correlation of CO2 and temperature
from 1975 to 2000, and
(c) No correlation of CO2 and temperature
from 2000 to 2015.
(1), (2) and (3) do not give ME confidence that CO2 is currently, or was ever, "the climate controller"
... and strongly suggest to me that man made CO2 including feedbacks is NOT as important as the CO2 lab experiments suggest.