Also from this article, between 1.5 and 2 degrees:
> widespread abrupt permafrost thaw
Which is “fun” because that releases a boatload more carbon into the atmosphere.
> widespread abrupt permafrost thaw
Which is “fun” because that releases a boatload more carbon into the atmosphere.
The other thing we have to consider is that if the model's range is between "everybody suffers" and "everybody dies" do you want to gamble with that?
Humanity is like a toddler, only learns when you feel the consequences, rather than learning by being told about it. Also like a stubborn toddler like first needing to experience an almost trauma to change behavior, and apparently we haven't had that trauma yet.
> The impact on the climate may mean an influx of permafrost-derived methane into the atmosphere in the mid-21st century, which is not currently accounted for in climate projections.
(Note this is an unexpected type of abrupt thaw; the models probably do include the impact of more gradual permafrost thawing. Cold comfort though, and polar ice is melting at a faster rate than predicted overall.)