Actually, with the cost of the means of production falling, and with access to information now much more widespread, things could be different this time.
There were similar portents of doom in the 60s and 70s (over-population, food shortages, raw materials running out, thermonuclear war leading to nuclear winter), that were forecast to happen in the 80s and 90s, but we are all still here and (mostly) surviving.
I would rather be an optimist (even in my late 50s) and fairly happy and be occasionally disappointed, than be a pessimist and always be miserable waiting for something to go badly...
ymmv