Probably cause deep down we know something is happening and it feels like shits about to hit the fan. Ocean temperatures are skyrocketing and we can't pretend everything is fine like we have for the past couple of years
Things in generally seem to be getting worse for at least a decade, especially for those born in this century.
Granted, the whole Ecological problems thing has been going on for longer, though there were some improvements in the 70s (polution controls that stopped acid rain) and the 90s (replacing CFCs and reverting the hole in the Ozone layer) but even some of those things were partially reverted in the last decade or two (the whole Diesel Emissions Scandal is to a large extent about emissions of the very same stuff that caused acid rain and hole in Ozone layer is growing again apparently due to CFC use in China).
As many have pointed out, the reversal of the trend of improvement in the median quality of life is probably because we've reached Late Stage Neoliberal Capitalism.
For some it’s doom and gloom for others it’s flourish and best times since forever. Such is life
Ancient cycle of bad good bad good as old as history.
Still, we are lucky to be born in first world countries, we probably share that in common, so our situation is from the start nicer than 80% of the world.
I recently discovered I suffer a lot of victim mentality which constrained me and probably made me partly insufferable so maybe it is something that troubles you too or not