[ncmncm]

If you imagine rising atmospheric CO2 is not a big enough problem to collapse civilization, you are just not paying attention.

At the point where ocean pH falls enough that the basis of the ocean ecosystem collapses, ending access to protein for at least a billion people, global war will follow.

When 100 million people find they cannot grow food where they are, anymore, or even survive outdoors on certain days, they will move to where they can. But people already live where they would go. That pushes fascists into government. Global war will follow.

Before anything that directly threatens civilization, indirect effects like that will force war, and shortly collapse civilization. It will go fast. Nuclear weapons will come out. Global supply chains will vanish never to return.

If you don't think global thermonuclear war would collapse civilization, you are not paying attention. Millions of people would survive it. Probably. Not us.

It might still be possible to forestall this outcome. But not from in denial.