I have these two sentences stuck in my head these days:
A French minister: we need to prepare ourselves for a future when temperatures are 4°C higher.
A climate scientist: with a rise of 4°C above pre-industrial age, up to 90% of the world's population may die.
(edit: muting the post, it's going way beyond its intended audience, I'd like to be able to see notifications about other things. thanks you all for sharing)
There is always the possibility to move underground too. Life will always find a path (not saying this is a path I want though :S)
@CubeRootOfTrue According to https://permaculturism.com/how-much-land-does-it-take-to-feed-one-person/
To feed 1 person for a year with veg, fruit, eggs, chicken, milk, wheat & grain you need ~2 acres of land
I was taught you also need a fallow field & you rotate this field each year
So say ~3 acres with ⅓ unused a year
You could use a shelving system to reduce the total footprint but that's still a fair amount of space & that's just 1 person with simple tastes doing all the work
No way is a billionaire doing that
@CubeRootOfTrue @Beldarak @David The lights don't last forever, equipment wears out, spares run out, reactors eventually burn all their fuel
So we'll need a scientific, industrial & even mining capability to keep things running
The climate isn't going to recover in a decade or two, if it ever does
People are going to be down there for lifetimes
We're effectively discussing building a "Generation Ship" either in a hole in the ground or in orbit
It's a huge task
@CubeRootOfTrue @Beldarak @David I just had a look at some lifetime stats for large US nuclear reactors
These are currently certified for around 80 years of operation, so call it a century before major work is needed to give it another century
No idea how long a mini one is supposed to last but I doubt it's any longer
@CubeRootOfTrue @Beldarak @David The fuel rods seem to last about 5 years before they need replacing
They've used about 10% of their fuel in that time & it's possible to reprocess them to make new rods
But eventually you'll need new fuel rods
You don't just plug it in & go forever
Then of course there's what do you do with all the highly radioactive waste which you need to get out of your bunker, as far away as possible & not close enough to other waste that it causes a radiation hazard
David 
CubeRootOfTrue
Beldarak
staringatclouds