but what about all this obsession about ensuring that there are still humans in say 200 years, when anyone who might exist is a complete stranger to us?
Haven't made the calculations, but I'm quite sure we could keep the current technological pillars of well-being (food, health, heating) without much issue to the environment if we gave up all the other superfluous crap (private cars, gadgets, plastics toys, 3d videogames, etc). And we'd probably be much less depressed too.