I disagree, most people I speak to are unaware of the scale of the problem or still hold delusions that it will be sorted out by some kind of future tech by the end of the century. A shot of doomerism gets their attention way more than banging on about positive change and plastic straws.

I am fully aware fusion isn't a magic bullet, that's the reason I provided it as an example. It's about as likely as convincing the world degrowth is the better option.

The solutions are not consumer based, nor are they possible at a grassroots level. Literally everything tried so far has not moved the dial in terms of emissions. Joining groups like ER, whilst commendable, is not going to affect enough change in time.

Millions may be discussing change as you say but there are billions who are too concerned with day-to-day survival to contemplate long-term issues like climate change.

Best things to do are actually to not have kids and vote for green candidates, both of which I'm doing. When we see a global top-down movement via policies and laws that might make any kind of difference then we can discuss individual action in positive terms.