Regional collapses have happened. This will be the first global collapse.
If it happens, it will be much earlier than you hope, as millions, then tens of millions, then hundreds of millions force their way across borders, and fascist governments ride that into power and then start a global thermonuclear war. The refugees will only be fleeing crop failure and increasingly murderous kleptocratic government.
It is already starting. Lots of governments are flirting with dictatorship, and many have got there already. US and Brazil have drawn back a hairsbreadth from the brink, but for how long?
If it happens, it will be much earlier than you hope, as millions, then tens of millions, then hundreds of millions force their way across borders, and fascist governments ride that into power and then start a global thermonuclear war. The refugees will only be fleeing crop failure and increasingly murderous kleptocratic government.
It is already starting. Lots of governments are flirting with dictatorship, and many have got there already. US and Brazil have drawn back a hairsbreadth from the brink, but for how long?