Hi David,
Thanks for the climate emergency report. We could add a sea level emergency to that, because of the Greenland tipping point - see my letter to the FT on behalf of PRAG 1].
The conclusion which you must now surely make is that our best hope is SRM, and SAI is the only available technique at the necessary scale.
Emissions are expected to remain around their current level till at least 2050: the fossil fuel companies will see to that. No cooling can be expected from emissions reduction. We are on path for 2C by 2040 at the expected rate of temperature rise: 0.36C per decade average according to Hansen, see diagram attached. 4C is more than likely by 2100 without direct cooling intervention.
But the Arctic is warming about 4 times faster. We are approaching the tipping point - a point of no return - for the whole Arctic, when the various catastrophes from meltdown all become inevitable. Emergency deployment of SAI to lower the Arctic temperature and halt the meltdown should now be a priority.
The possibility of collaboration of the major powers in the deployment of SAI could be a force for peace, even with increasingly authoritarian governments. Is there a chance of promoting this vision to your readership? Please.
Cheers, John
[1] Nissen obo PRAG (FT, January 26th)
Greenland meltdown and the reasons it matters