scientifically proven ecological collapse

This is a pretty specific thing, but the general "we're all doomed" vibe is definitely not unique to today. Boomers and older had the threat of nuclear annihilation looming over them, and before that... well, disease and famine and death and destruction due to war have historically been the norm.

Imagine how you'd feel living in the Americas in the 16th or 17th centuries and either watching the destruction wrought by European settlers firsthand or, maybe worse, watching your peers die en masse of the diseases introduced by those settlers. Imagine living in Eurasia in the 13th century and watching the Mongol army sweep through.

None of this is to say that today's challenges aren't real and serious. Just that we're not the first to face such challenges.

The greatest and silent generations saw some shit

Considering science has only gotten robust enough to prove anything like that far more recently than any good examples of ecological collapse, I'd say this parameter is a little arbitrary.

The best example I can think of regarding ecological collapse is during and after the fall of the Western Roman Empire. Their climate decreased in temperature, which reduces crop yields, which weakened the empire and encouraged migration from northern Europe, which brought their collapse (plus like 12 other things lol).

In 535AD, during Justinian's reign in the east, the first black plague happened following a supermassive volcano that left the sky covered in ash blocking the sun. This was a massively ecologically damaging period of history and it caused the death of countless plant and animal life, along with the deaths of half the population of the Mediterranean.

It's not like people of this age were taking soil samples and references trends or whatever, but they certainly understood how things were going poorly.

The ozone layer depletion was a very serious threat. The solutions were a lot easier though.

Find the good in eat. We can finally get rid of society's parasites. Landlords