I reached out to Pierrehumbert because he is one of many authors of «Consequences of twenty - first - century policy for multi-millennial climate and
sea - level change,» an important new Nature Climate Change analysis reinforcing past work showing a very, very, very long impact (tens of millenniums) on the Earth system — climatic, coastal and
otherwise — from the carbon dioxide buildup driven by the conversion, in our lifetimes, of
vast amounts of fossil fuels into useful energy.