You get unreliable weather patterns . monsoon in dry places, and monsoon dependent countries falling dry..

And thus unreliable investment, a house or factory might be flood prone in a dessert valley, a dam with power stations might fail to provide.

So you have uninsureable riches, that might aswell no longer be there.

And as a consequence, massive migration from inhabitable regions. Hard to imagine the implication when there are billions of people affected

Not important, but I want to briefly point out as a Grammar Nazi that you mean uninhabitable regions. Inhabitable and habitable mean the same and their opposites are uninhabitable and not habitable. This is one of those bizarre oddities of the English language.

Just for kicks:

    English       | French
    --------------+------------
        habitable |   habitable
      inhabitable |   habitable
    uninhabitable | inhabitable

What have the natural romanic languages ever done for sus?

would ainhabable or antiinhabable be correct ?

No.

Climate migration from South and Central America to North America has already started. If the US think they have an immigration problem right now, I can’t imagine how vicious immigration propaganda is going to get when that number goes up by an order of magnitude.

The consequences of the reversal of the current or the consequences of CO2 in the atmosphere doubling?

Yes