Old news.
I've been watching the Arctic meltoff for several years now.
Quantifying the methane or whatever greehnouse gases trapped under the ice or muck is wildly speculative, almost as speculative as my estimates of how much excess CO2 is going to be sequestered yearly by raising average temps 4 degrees. You are talking about cenigrade degrees, right? 15C doubles rates, removing the ice increases the sunlight available to photosynthesis. All that methane will be oxidized to C02 with some theoretical half life dependent on sun radiation and temp..... also going much faster.
The additional CO2 will spread worldwide, and it will significantly increase growth rates from photosynthesis.
It might be a pretty wild ride, but as weather changes or climate changes, humans will change too. They will plant in different places maybe. I don't think your egghead fearmongers or your Alarmist Press folks know anything. Really.
But worse yet are our politicians who will use the excuse to actually prevent humans from making adjustments, gathering people into urban corrals, concentration camps really, like Indian Reservations, and making people live on scarce rations of weevily bread or worse.
Nobody kills more people than authoritarian governments, not even Mother Nature.
So what I've been seeing in this meltoff is changed ocean currents, wind patterns..... not exactly the old El Nino/La Nina flipflops. Less cold water runoff from less ice to be melting, the sister fact to warmer temps over land now not covered with ice, or having an ice pack a few inches beneath the surface. This changes the whole climate pattern. What it looks like to me is a stronger polar vortex over Hudson Bay, and warmer surfaces on the oceasns..... the higher lattitude area between Hawaii and Alaska, and warmer water off the Pacific coast, and a lot hotter water in the Gulf of Mexico. I don't know why that is happenintg exactly. I mean the Mississippi and Rio Grande aren't exactly a source of 4C water for the ocean floor.
These are the necessary conditions for starting a new Ice Age, kiddies.
This year the late meltoff in Northern Michigan made the news with some little flood events downstream from crappy reservoirs.
The real question is whether we are just going to have another little cycle a few degrees cooler from the present, or if the warmth of our oceans can sustain a larger buildup of the Hudson ice sheet, which is the largest ice sheet the world sees in an Ice Age.
If we had a strong solar cycle on the 22 yr variation on top of a strong 300 and 3000 year cycle or whatever the periodicities may be, I'd say we could really get a new Ice Age. Or maybe....just maybe.... if we burn enough forests and oil, we can make the difference and help start the next ice age.
Pretty sure it takes something bigger to get our oceans all frozen. Something Galactic, or a helluva lot of calderas blowing off in sync...
This is an equation your egghead experts and paid stooge bureaucrats and Mass Propaganda Alarmists just figure the Peasants really can't be told about. The job to be done is to get the stupid people paniced into better management, as measured by our Fascist Movers and Shakers. Pretty sure the FM&M clique would make damn sure to fire anyone who wrecks their dictated narrative.
Because the fundamental equation for an Ice Age is warm oceans and cool land masses or ice surfaces(less solar heating). a relation that must survive summer meltoffs for several hundred years. In the high Sierras, 20 feet of snow will melt off during the summer, but in the Arctic 5 feet of snow won't. Warmer air generally causes more snow in the higher latitudes and altitudes, and then there is this funny reflectance thing. A fress ice cover will cool the air, especially over Hudson Bay.
I really don't think our expert climate modelers think this far out....
Every Ice Age we have information on was preceded immediately by a temp spike like what we see now,,,,,, well about twice what we see now.
But cheer up, this is a cycle that will produce feedbacks that limit it, usually. cold water from under the ice restoring normal heat balances to our oceans. More clouds, more humidity over the ice helping to hold heat in ou atmosphere Growth rates and CO2 depletions shrinking.... all that stuff.