> It becomes "fastest animal" race for the door (or mountaintop fortress or whatever).
As a planet, we are at that point already, we have been at it for at least a decade or longer when people started migrating inside of Africa and then towards Europe as droughts made farming and survival fiendishly difficult to outright impossible.
And our politicians have already begun preparing for the real escalation of the climate wars - the US have built a massive border wall in the South and are quite okay with dumping water left behind in the desert [1] and other atrocities, and here in Europe Frontex has been engaging in illegal pushbacks and criminalization of sea rescue for years as well [2]. We are normalizing atrocities to keep the Western countries clean from the consequences of mostly our own CO2 emissions.
> Simple efficiency is a real solution given actual implementation. Do not throw out goodwill and stability with this political violence spectre.
There is no goodwill left in US politics, not on the Republican side at least. Europe has the goodwill, but unfortunately a lot of decisions require unanimous consent and China particularly has used the 2008ff financial crisis to strategically take over critical assets and countries, not to mention the historic links Russia has to major German and Italian parties. As I detailed below, I see it highly likely that a frustrated populace - either from the left or the right wing, but I believe that the far-right will be more effective - will resort to massive social unrest like in France with the Yellow Vests.
[1] https://www.washingtonpost.com/news/post-nation/wp/2018/01/2...
[2] https://www.spiegel.de/international/europe/frontex-scandal-...