Potemkin wrote:The wet bulb temperature is almost always much lower than the actual (dry bulb) temperature. Before most of the Earth passes the wet bulb temperature of 35 degrees Celsius, human industrial civilisation will long ago have collapsed, ending the release of excess CO2. As I said, we'll be living in mud huts and large parts of Africa, the Middle East and Central America will likely be uninhabitable, but we won't go extinct.
No, Potemkin, this is what you wrote.
That will get worse, of course, but most of the Earth's (current?) land surface will remain habitable.
Now you say, "large parts of Africa, the Middle East and Central America will likely be uninhabitable, ..."
To this I would add large part of the Amazon, etc. in S. America.
I added the 'current', because I doubt you were thinking that most of 1000 sq. miles still remaining land was all the land area you meant.
So, climate scientists tell us that after civilization stops putting CO2 into the air the temp will keep going up for a long time, because ---
1] There is a time lag between CO2 levels and the time when the Earth reaches equilibrium for that level of CO2.
2] The permat frost will continue to out-gas CO2 and methane for a very long time, maybe 100 or so years.
3] The ice free Arctic Ocean will be absorbing heat all summer long.
4] The global dimming effect that we produce by adding arrasols to the air will end, which will add about 1 more deg. C of temp increase.
5] Forests will die back or burn. Yes, they may regrow further north but this will take time. In the now, burning and rotting wood adds more CO2 to the air.
6] Other tipping points we/I don't know about yet.
Also, sea level will be raised a lot. I have seen estimates over 40 meters = 126 ft. This will reduce the land area for humans to live on a lot. [Those inland seas in Kansas were partly the result of there being no ice sheets when the dinosaurs lived. Also, Kansas is higher now, though. The point is still valid.]
So, it depends on just how hot it will get. IMHO, if there is 7 deg. C temp increase form now, humans will be extinct.
You may have given up all hope that we can avoid the collapse of civilization. I have not. I am willing to accept and to impose on all humans some limits to save civilization. You and frankly almost all people on Earth are not willing to go to the extremes necessary.
. . .This is why I have proposed rationing and limits on child bearing. No one else is following my lead. To my mind rationing and limiting children is not that much to give up to save humanity.
. . . Americans and the British subjects survived WWII. If the West and other advanced nations cut back to that level of consumption or maybe to a WWI level, and let the rest of the world improve their consumption some, it would be enough to save us. Of course green energy also needs to replace the of burning coal and oil, etc.
We might have the target of 1.5 children per couple. This would let every couple have 1 child (50-50, male v female), and then let each nation figure out how to spread out the other 1/2 child in a fair way for its morals. Some ideas are ---
1] Let the richer people buy the right, and use the money to pay the poor to raise their 1 child better.
2] Have a lottery.
3] Sell all those baby licences to other nations to get more money to invest in their nation.
4] Buy the right for more babies from the above nations.
The key thing is --- no exceptions for any reason. For example, religion must give way to survival.
I know, it is unlikely to happen. Almost all Americans would see their living standard drop, while almost all blacks in Africa would live see their living standard go up. And, Americans have been taught to be too selfish to accept this.
Like I said, I would die if by dying I could save humanity, but if all who accept ACC die, this leaves only those who don't accept that changes are necessary because of ACC. So, if all like me die it makes the situation worse, not better. If you don't grok my point, let me ask you, would you die to save America from the Liberals/Socialists, would you die to save America from the Trumpers, would you die for your religion, etc.? If you answered yes to any of those, then you should be able to grok my point.