The pandemic made people realise that a virus could take over the world at any moment. One that might be a lot worse than Covid, one that can't be vaccinated against.
The Russian invasion of Ukraine has made people realise just how fragile our lives are. If Putin decides to press the nuclear button, and his military obey his commands, billions of us could be killed in a matter of minutes. Life as any of us know it could end.
People have a finite capacity for worry. In recent years they've filled this with concern about the climate, equal rights and so on. But in the last couple of years this capacity has been filled with much more important matters.
There's no point worrying about what the world will be like in fifty or a hundred years. Most of us will be dead by then. If you're concerned, don't have children and then you won't have to worry about a future with climate change.
We're not on this planet for a long time - less than many of us might expect, given the lowering of life expectancy and risk of nuclear destruction at any moment - so we may as well just enjoy what time we've got left, as individuals and as a species.
Put another way, to me it seems more sensible that people in a hundred years will be cursing us for not stopping climate change than it does for us to fret about a future that might not even happen.