These discussions tend to be heavy on Asimov-inspired scifi-think and weak on just taking a walk in a forest on a nice sunny day in late spring. All this talk about having to colonize space is just rubbish, compared to the wonders of nature that would be worth preserving.
But the audience here is strongly biased. If most of your day is spent in front of a computer and reading scifi novels in the evening, then that's where the discussion moves.