Such solutions are good for the sustained existence of humankind at population levels close to the current one.
This is not what "existential risk" means. If some disaster was guaranteed in wiping out 99.9% of all population, but not more, it poses no existential risk at all (assuming it's possible to rebuild eventually). For this reason, it doesn't seem likely that things like global warming or resource scarcity pose existential risk.
I think the general point is that a big population crash may well leave a remnant which is unable to re-industrialise (too few to make key inventions, too scattered, too many other problems). Or the remnant may have strong cultural pressures against re-industrialising, given it was such a disaster last time. The small residual population would eventually go extinct from natural causes, or evolve into something non-human. So the crash is an existential risk.
I wish to transfer to a university in Europe, to complete my engineering formation. I thought it might be the opportunity to initiate a discussion on the merits of European technical schools, given how many people here have a STEM background, and have experienced the first-hand.
Which ones do you think are best at teaching? Which provide the best starting point, professionally? Which have the most productive, idealistic mood among the studentship? If you've been to several of schools, how do they compare to each other?
The floor is yours.