I’d guess that WWII’s worldwide firebombing campaigns vs WWI’s use of large clouds of aerosolized gaseous weaponry, but that’s just a guess.
Firebombing heats things up, and kills vegetation that keeps things cool. Aerosols and other particulates temporarily reflect extra sunlight back to space.
What’s the temporary warming during WW2?
And there’s also a temporary cooling during WWI.
I’d guess that WWII’s worldwide firebombing campaigns vs WWI’s use of large clouds of aerosolized gaseous weaponry, but that’s just a guess.
Firebombing heats things up, and kills vegetation that keeps things cool. Aerosols and other particulates temporarily reflect extra sunlight back to space.
Just a hypothesis.