Had the the Bolsheviks failed to seize power in Russia in the late 1910s (I believe that David T has previously outlined some ways to do this), what would global warming have looked like throughout the 20th and 21st centuries?
Basically, the reason that I am curious about this is because Communism slowed down economic growth in the countries where Communists were in power (and if the Communists don't seize power in Russia, they probably don't seize power anywhere or at least in any large country). Plus, the strength of Communism worldwide might have conceivably caused some non-Communist countries--such as India--to pursue socialist economic policies which also slowed down economic growth there.
Anyway, what would global warming look like in a scenario where Communism continued to merely be the stuff of academics rather than of national leaders and policymakers? After all, if countries such as Russia, China, and India become wealthy and industrialized earlier than they did in our TL, then there would be more global CO2 emissions occurring earlier. In turn, this would create a more severe global warming problem earlier for humanity--at a time when humanity had less powerful technology (in comparison to today) to deal with this problem.