In her treatise on the New Left, written in 1970, Ayn Rand noted this phenomenon. The old left promised a better standard of living, and failing to provide it, glorified the “struggle,” While the New Left glorified a lower standard of living.
The elite of the Green Left are well aware of this fact. Some argue that this half billion or so historic level of humans is all that is sustainable. Others are willing to concede advances in technology might make the current sustainable level 4-6 times the historic level.
But they all agree they should be the ones in charge of deciding which humans should be allowed to remain as part of the sustainable level and which should go. That is how arrogant these b*st*rds are!
Almost all of them romanticize primitive lifestyles because they consume fewer resources. They are quick to point out that Americans use much more than "our share" of "scarce" resources such as lumber, oil, etc. OTOH, they ignore that Americans produce a far more overwhelming share of other resources such as corn (65%), steel (30%) and plastics (40%) because, in their demented mind, these are not natural resources and, somehow, the process of turning the most primitive parts of nature into something which is technologically advanced is not part of their sustainability equation.