Just look at the former Soviet bloc to see how pristine their enviornments were under 'socialism'.
Tragedy of the commons - pretty bad when 100% is commons. The expansion of private property rights is the best possible thing that could happen for the environment. That such policy is not embraced is evidence of extreme economic ignorance and/or evidence that ecofascism is merely a convenient cover for the expansion of socialism (the environmental movement has been hijacked by “watermelons” since the 60’s - green on the outside, red on the inside).