Communism in eastern Europe produced pollution on a scale unimaginable in the West. Their industry was also woefully inefficient in terms of CO2 output per KW and their usage of energy... but CAPITALISM!!!!1! I guess.
It was not communism: it was totalitarianism/fascism. A government run by a few private interests to the detriment of the people and the land.
They only called it "communism" to confuse their ignorant people and knee-jerk Republicans and their fear of those dirty poor folk.