Nuclear war is still possible. Acid rain is still bleaching forests and marshes near me. Our economy is kinda hosed at the moment. Endless conflict in the Middle East/SW Asia. Uiyghurs are enslaved. And of course resource depletion and climate change.
It's not sunshine and lolipops.
If issues command more attention time each day they feel more important. Generalplan Ost might have killed twice as many people at the same time as the Holocaust but most people never heard of it because it didn't get that much prime time. And the Bangladesh or Indonesian genocides flew under the radar for most people around the world.
Lots of things are possible but the likelihood, and the fact that this is hammered into your head via every channel make all the difference. Nuclear war is possible but if FB would throw this possibility at you every day I can guarantee you'd see it with very different eyes and feelings.
Just going back a few decades you had things like AIDS or the hole in the ozone layer. So each generation had their own burden to bear. And things like global warming aren't something that hit one particular generation (unless it triggers a catastrophic and quickly unfolding event), it just erodes away the niceties of life with each generation.