Except that there are civilisations which have died out due to overexploiting their environment, or the climate changing and killing off their agriculture. Tha

Except that there are civilisations which have died out due to overexploiting their environment, or the climate changing and killing off their agriculture. That's two risks. You can add others now which haven't previously been possible, such as disturbing your ecosystems to the point where there's another mass extinction looming, or changing the climate to the point where you spark famine, wars, lack of water, etc. That's where all of the rational discourse backed by evidence (aka. science) is pointing.