It's true. Communism did fail to drive the world in to an unrecoverable global warming feedback loop which will have irreversible, apocalyptic consequences and likely kill hundreds of millions or billions of people over the course of the 21st century. If only they'd allowed the invisible hand of the free market to gently caress them who knows what heights of unmitigated carbon emissions they could have achieved? And they didn't learn their lesson! Those filthy communists in China rolled out more reknewable energy infrastructure than the rest of the world combined last year?! How are we supposed to boil the seas and turn Earth in to a second venus while Communists keep producing innovative new technologies in an attempt to mitigate the worst horrors of global warming?!

Tell that to Cuba.

why was it always succesfull then , even under constant brutal active or economic assault from the Imperialsit core ? Speaking of , where was capitalism succesfull ?

Unless you're a genocidal maniac. Then tens of millions of deaths is a complete success.