Climate change is first and foremost a threat to human society.That fact has been somewhat obscured in regular discourse, in favor of a false dichotomy portraying climate policy as an upper-middle-class noblesse oblige idea for anxious birders and other environmentalist types, and hardheaded economists who think building up yet more wealth is more important.
In reality, one obvious way that threat to humanity is going to be expressed is through economic damage. In other words, unchecked climate change is going to be terrifically expensive.Now, its exact cost is basically impossible to predict. Contrary to people who would confidently rely on cost damage estimates for 2100, economic projections tend to be wildly inaccurate over even five years.
Furthermore, the amount of damage will depend greatly on what humans do in the future, and there have been few studies on what damage would be like under higher warming scenarios of 3 degrees or above.