I find the awareness that the Earth is the only place on which humans, let alone modern civilisation, is likely to be able to exist and thrive, to well within the likely timeframe in which we might well eliminate some or all of that capability (say, the next 10, 100, or 1,000 years) makes for far more nuanced consideration.

What humans do to this world in the immediate now will have profound implications to what humans will be able to do anywhere, in any possible future.