[zabatuvajdka]

If there’s a heat wave and drought the only way is to dig tunnels and build cities underground. Water can be imported from the ocean (rising sea levels) and desalinated using solar/thermal power above ground and feed an aquifer!

[Sharlin]

What is actually going to happen is displacement. The hundreds of millions of people most vulnerable to the consequences of climate change don't have much choice but to start walking. The 2015 refugee crisis in Europe was nothing compared to that, never mind the tiny trivial inconvenience that is current illegal immigration across the Mexico–US border.

[marcyb5st]

Agreed. Europe struggled to relocate 2.5M of refugees over several years.

What happens when people from India, the middle east, ... are forced to relocate? I expect some kind of conflict/war of expansion and probably famine since a lot of the land will be abandoned and hence become unproductive.

[Sharlin]

I'd expect the land to become unproductive first. A huge amount of agricultural land is threatened by the climate change, accelerated by other anthoropogenic effects such as soil erosion due to deforestation. Besides drought, heat, wind, and excess rainfall, there's flash floods caused by melting glaciers in the Alps, Himalayas, …

[marcyb5st]

True. And at that point I really believe unrest will be widespread. The saying "We are 3 meals away from anarchy" will prove its veracity.

[markenqualitaet]

I think Bangladesh is also scheduled for certain crisis.

And let's be real, no wall (or frontex and the like) will ever keep out billions of people. If the world doesn't get its shit together and respond globally and collaboratively now, this will get ugly beyond imagination and no one, no matter the edgy coldness of their x-first attitude, will come out of this recognizable. People won't just die politely, much less when informed about who's to blame for all this hell.

I think there may be even possible consequences beyond everyone's worst nightmares when we see massive ecosystem collapses. What is it gonna be like, if you have unimaginable fields of mold and bacterial overgrowth? The winds bring Sahara's heavy mineral dust to Europe now, I am sure spores and toxic particles fly much better tomorrow...

[fencepost]

On a purely technical basis that may seem reasonable.

On a "we're talking about human beings here" basis what do you do about all the people who feel that the selection and admission process was corrupt and that they've been robbed of their chance at safety? Do you expect them to meekly acquiesce?

[14]

I imagine once the first big wave where a nation hits the wetbulb temperature and there is a mass die off you will see panic in surrounding nations and they will scramble to a border. What will nations do with millions of people knocking at the fence wanting in? Uncertain times for sure.

[burntoutfire]

I imagine this happening only in the least well-run countries. In any country with a functioning military, they'll probably organize a mass operation of moving people into temporary refugee camps in cooler areas of the country or into caves, underground structures etc. For people who won't be moved, they'll provide food and water for them so that people don't need to leave their hiding places during the day. (Also, I suspect that, after first major killer heat wave hits an area, people will have their own contingency strategies - be it digging a cellar for themselves to stay in, move to relatives in cooler areas for the duration etc.). However, I'm not sure if for example India is organized enough to pull this off, given their absolutely massive population.

[nradov]

The countries that will be most affected generally don't have well-run militaries either. We're talking about places like Bangladesh and El Salvador.

[zabatuvajdka]

It’s going to be a global scale “north versus south” war like in South Park—everyone will blame Canada… and Satan will… err never mind. :)

[swiley]

I'm always a little surprised the islands in the Canadian archipelago never seem to be sold.