So you can breathe easily if you can afford bubbler supplies, hmm. Not sure the global economy is surviving 4k ppm unscathed though. Not entirely convinced "the economy" will mean anything at all any more. :)
End of our civilisation. End of us as an industrial society. Perhaps as relevant and historic as the Romans or Ancient Egyptians. I'd prefer to stop long, long before that.
Who knows all the knock on effects of 4,000ppm, I certainly don't except to say it's way beyond the worse case models I've seen. End of much productive work outside. Reduced performance for all. Probably much of the equatorial and tropical simply uninhabitable. We'd be looking at what, 7, 10, 12 degrees? I have no idea. Heaven knows how many reinforcing tipping points will kick in. I don't think we can confidently say it won't result in actual extinction. Even if it probably won't.
We'd lose both ice caps, so something like 60 odd metres of sea level. How many major cities and entire countries does that lose? I've seen maps that at just 4C much of the USA's farm land would be near desert, and the Sahara greening. Unprecedented temperature, habitat and rainfall changes with no idea which species will make it, and which not, maybe many we depend on to eat. How much forced and unwelcome migration? Which prediction is the accurate one? With that energy in the system are we looking at cat 10 super-hurricanes?
Does it matter if it's 0%, 1 or 2%, or even 10% are grubbing out a post-apocalypse zero growth life or whether it's Mad Max, 18th C or bronze age? Unrecognisable. Unpredictable. Survivors would tell fables that their ancestors did it. Knowingly. Maybe some other species gets its chance and does a less idiotic job.
End of our civilisation. End of us as an industrial society. Perhaps as relevant and historic as the Romans or Ancient Egyptians. I'd prefer to stop long, long before that.
Who knows all the knock on effects of 4,000ppm, I certainly don't except to say it's way beyond the worse case models I've seen. End of much productive work outside. Reduced performance for all. Probably much of the equatorial and tropical simply uninhabitable. We'd be looking at what, 7, 10, 12 degrees? I have no idea. Heaven knows how many reinforcing tipping points will kick in. I don't think we can confidently say it won't result in actual extinction. Even if it probably won't.
We'd lose both ice caps, so something like 60 odd metres of sea level. How many major cities and entire countries does that lose? I've seen maps that at just 4C much of the USA's farm land would be near desert, and the Sahara greening. Unprecedented temperature, habitat and rainfall changes with no idea which species will make it, and which not, maybe many we depend on to eat. How much forced and unwelcome migration? Which prediction is the accurate one? With that energy in the system are we looking at cat 10 super-hurricanes?
Does it matter if it's 0%, 1 or 2%, or even 10% are grubbing out a post-apocalypse zero growth life or whether it's Mad Max, 18th C or bronze age? Unrecognisable. Unpredictable. Survivors would tell fables that their ancestors did it. Knowingly. Maybe some other species gets its chance and does a less idiotic job.
I don't think the difference matters. At all.