Clearly you're not factoring in the nuclear winters that the third and fourth world wars will provide for us within that timespan if climate change destabilises world politics to the predictable degree.
Hopefully! I'm guardedly optimistic, because I think renewable tech will save us, but we're going to have some real stormy political times to get there.
Donald Trump, the conspiracy theorist gameshow host was elected president of the USA! And might be again! So there's no room for complacency.
Sorry to burst your bubble but even if we used magic to switch to 100% renewables tomorrow the warming wouldn’t stop for a very long time. We’re on a bad path no matter what we do, it’s just how bad?
You're correct to a degree, magically eliminating FF use now will not stop warming increase for some time (damn heat and gas equations and lag), but
we do have the option (whether we take up on that) to
* reduce input visible light by (say) using space bubbles to gently shade earth, and|or
* extract C02 from atmosphere using big industry scale procesess powered by excess renewable energy (and then to sequester that CO2 rather than use it to make more faux green synthetic fuels that return it to the atmosphere).
These are not easy things, these are things that require nation scale commitment and follow through, but yes, options exist.
What's bad about it? I don't mind the heat. And it's nice that the growing season is getting longer, the earth is greening and we're getting bumper crop yields. I'd be a lot more depressed in 50 or a hundred years or so when the cooling kicks in.
There's terrifying scientific evidence that nuclear winter is perhaps increasingly impossible as climate change continues and nuclear fallout (and even volcanic ash fallout) move us closer and closer to turning Earth into Venus 2: Electric Boogaloo thanks to the (runaway) greenhouse effect.
