Thanks for comments on Chapter 25 (Paleoclimate).
The moderate reframing of the way of looking at how orbital parameters
affect climate seemed to be appreciated, but my summary of the impact
of paleo data on our understanding of climate sensitivity was very weak.
The change in the five years after Charney’s 1979 report was night to
day. Charney concluded that there was a 50% change that 2×CO2
sensitivity was between 1.5 and 4.5°C. Five years after Charney,
thanks to paleo data we knew: (1) climate sensitivity is in the mid to
upper part of Charney’s range with the usual 95% confidence, (2) there
is a substantial delayed response, thus warming “in the pipeline,” just
because of ocean inertia and fast feedbacks, (3) over and above that,
there are amplifying “slow” feedbacks, some of which may not be so slow.
Revised Chapter 25, with many minor fixes and a completely new summary is available.
A draft of Chapter 26 (1986: Greenhouse Testimony to Congress), available for fact-checking here, reveals the genius of Rafe Pomerance and Michael Oppenheimer.
You can sign up for our monthly global temperature updates here.
You can sign up for my other Communications here.
I opened a Twitter account @DrJamesEHansen, (https://twitter.com/drjamesehansen), but I am focusing mainly on finishing the book.
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