[snip]
... so only one billion or so dead instead of three? Only five instead of seven? Only six and some change instead of the whole shebang? Or are we talking really lucky and only losing a few tens or hundreds of millions? What you're describing still has a death toll unseen in human history. I'd like to know ahead of time what to expect, so we can start trying to figure out ahead of time how to deal with all the corpses.
S'just... yeah. I've reached a point of damned morbid now. Throwing out a few comments, then eating supper and throwing in for the night. And for the record, MSH, I wish to hell I could see this issue like you seem to, right now. You seem to be considerably more optimistic, or at least less hopeless, about it.
Even if all, and I mean literally all of the ice on Earth were to be melted (a feat even under liberal estimates of temperature change) it still wouldn't flood all that much land. We'd lose a bunch of coastline cities and low areas, but most would stay high and dry.
The relocations alone you mentioned would cause an absolutely massive systematic shock to the countries that are forced to push them through, and the loss of life fallout from that would be (will be?) horrendous.
You do realize that the vast majority of the human population lives in those coastline cities and low areas, right? Moving them is definitely possible, but the logistics of doing so is terrifying.
Plenty of agricultural plant species could still be grown even if warming were to go total. They aren't that fragile to begin with, and are even less so now that GM strains are out there.
Plenty of strains could be, maybe. Why aren't they now? The states alone are going to be taking a massive hit to at least one of our primary food crops
this year. It's not quite so simple to go from "having viable species that can survive in GW situation" to "growing enough to feed the human population." Throwing shiny new tech at the problem only does so much if it's not done
preemptively.
Furthermore, life on this planet is all very adaptable. I might remind you all that there have been multiple extreme extinction events in the past, ones that killed off the vast majority of existing life on the planet, and that which was left obviously managed to thrive.
The life that managed to thrive after the major extinction events did so
after expanses of time longer than the history of mankind... that's not very comforting to most macrofauna, including humans. To put it a different way, yes, life has survived multiple extreme extinction events. The verdict's still incredibly out on whether
humans going to be able to survive
this one, and more importantly, what sort of shape it's going to be in if we do. It's pretty damn likely we will if
any non-insect megafauna does, but the shape we're in at that point...?
As for overcrowding, understand that every human being alive today could fit in the city of Los Angeles. We don't really take up that much space, and if push comes to shove you can fit a lot of people in a relatively small area. It isn't paradise, but it's doable.
Sticking people in small spaces causes massive issues. Logistics, psychological, and physiological issues we
still haven't fully been able to deal with, as well as a very, very notable reduction in quality of life for tremendous swaths of the population involved.
"Isn't paradise" is a massive understatement of how bad what you're describing would be for much of that population.
And all of that, all of that, assumes a worst case scenario where no one does anything to stop climate change at all. In reality, environmentalism is mainstream politics in the US regardless of denialist Republicans.
Yeah, it's mainstream politics. The bigger issue is if it's mainstream
business. If huge swaths of populations across the world are saying, "Do something about this goddamn now," and the powers that are actually funding the major sources of the problem are saying, "Nah." what the hell do we do?