You're presuming the human race has another hundred years left?
I'm hardly a natural optimist. But then again, people have been predicting the end of civilisation for centuries & we're still here. The modern problem is that we now actually have the means to wipe ourselves out at a stroke.
So far so good, we've managed to avoid it for 70 years. It's my firm belief that if it turns out to be nuclear armageddon that wipes us out it'll be as the result of some ****ing stupid accident.
It definitely won't be climate change though. How thats going to play out is painfully & depressingly obvious.
Fossil fuels have roughly 130-150 years left before they're all gone for good & the arguments become irrelevant. So, regardless of climate change plans need to be made.
There are 2 paths.
Vast expenditure on research & development of alternatives plus setting up infrastructure for storage & distribution on a global scale. Requiring international co-operation to insure reciprocal arrangements between parts of the world with different resources.
OR
A series of escalating brutal wars over the next century to wring the last drops of profit from a dwindling supply. At the end of which the problem will still exist & everyone will suffer.
Like I said. Painfully & depressingly obvious which path we'll take.
Hopefully at the end of it all with only half the current global population left the human race will finally realise after 6000 years that the type of people we allow to be our leaders is a shit idea. Not much hope of that though. better to just **** off to the moon & mars & start over.