The lowering of the planet’s albedo through melting ice sounds like the most worrisome runaway effect.
Yeah there are a couple of really scary factors that might compound into a catastrophe.
The Arctic permafrost is another such factor, it might amount to a twelve fold increase in atmosphere methane content if thawed.
I wish I could trade on climate model predictions. I think the notion that anyone can predict a chaotic system 15 years out is ridiculous, but i also think there are plenty of people who for some reason believe it can be done, and I'd like to take the other side of that trade.
Man you must think the field of astronomy is full of only quacks then, it's got climate as a subsystem!
You can trade weather futures: rain, temperature, etc. You can also indirectly express a climate investment viewpoint by trading commodities,though that'll be a little messier.
You can! Buy some property on the Floridian East Coast. I hear the values there have taken a beating due to sea level rise...