The comment I'm replying to is discussing things like not flying or not using electricity. I'd describe forgoing modern comforts as primitive.

While infinite growth is obviously not possible I think we are a long way from the population that we could reasonably support on a still healthy planet if we had the technology to do so. I also think that in a hundred years or maybe a little less we'll start to get big opportunities for growth in space, both in the form of doing manufacturing off world and creating new population centers.

yes the best argument of those telling us not to worry for this planet lies in their plan to leave it.