As I see it, the best thing anyone can do right now is to convince their friends and relatives that nuclear energy is safe and necessary; that will buy us a lot of time.
I can’t find it, but I read an article of some of the top climate researchers in Australia basically planning to abandon the country for themselves and their children.
Just the other day, there was an article here where the world’s leading coral expert was saying unequivocally that almost all the world’s coral will die within our lifetime (it sounds like he expected more like 10-20, though he wasn’t specific). He noted that 25-33% of ALL ocean species have part of their lifecycle in this coral.
Article: https://news.ycombinator.com/item?id=17842553
Unless we reverse this (sucking carbon from air using nuclear or solar power?), we emphatically do not have 200-300 years.
Which means that you may have the cure, but no one will be able to afford it.
The western style/modern life is not compatible with the planet, and our economy depends on massive growth being realized - if only to service our debts and loans.
Our biosphere is dying under the weight of just the past few years, with only a small fraction of the world enjoying a first world living standard.
Someone has to tell everyone that the party is over, and that they wont be getting that better life after all.