Actually I've seen an argument that environmentalism has killed more people than communism--mostly excess malaria deaths due to the banning of DDT.
I suspect it's not true, as the person presenting it took the low-end estimates for communist murders (terror famines and mismanagment-induced famines included) in all cases except Cambodia.
"Actually I've seen an argument that environmentalism has killed more people than communism--mostly excess malaria deaths due to the banning of DDT."
They have both killed millions. Which has killed more is just a technicality. Both are evil incarnate.