Owing much of it to my geology-heavy upbringing, I was worried we were fucked by the time I was 16 (my love of DNA and H2G2 led me to
Last Chance to See) and by the time I'd finished my geology degree (which as you might expect covered a great deal of climatology and fossil fuels) I was certain of it; I think the term
the Holocene Extinction Event was actually coined during my time at uni. In a way we'd already been fucked since well before I was born, and this was the major factor in me deciding from a very early age that I never wanted kids.
It's not a very comfortable thought to live with, and the true scale of even something as tiny as a single decade of weather isn't something most people can easily comprehend, so when confronted with all of this, denial is often the depressingly likely outcome. Even I'm somewhat in denial about the scale of the problem I suspect, and I certainly hoped I'd be dead before it got too horrifying.
But lockdown in combination with endless news reports on freak weather, and endless time with which to contemplate it in, has cemented the idea of anthropogenic climate change in most people's minds as a probable fact (even by Torygraph-guzzling father who's been ranting about "hippy do-gooders" my entire life has acknowledged there might be a teensy problem). There's a lot more political capital behind greener projects, although I think even if wholly drastic action is taken we're in for a really fucking rough fifty years.
As a related aside, I do believe overpopulation is very much an issue; yes, unequal distribution is one of the key causes of famine, and a billion new people every decade wanting cars, package holidays, fridges and food is certainly a huge logistical strain, but the only way we can actually grow enough food at all is largely down to our current overabundance of petrochemicals. Even if climate change leaves most breadbasket regions viable for farming, if we haven't curbed population by the time the oil starts running out, we'll likely have wars and mass famines not unlike something out of a pulpy Mad Max ripoff.
<goes off to watch one of the first eco-disaster movies
The Day the Earth Caught Fire and reminisces about the good old days when the worst thing we had to worry about was nuclear war>
All of the above probably sounds very depressing, and I dare say it is. We won't and most likely can't save everything but that's not an excuse to not at least try saving something.