us federal government says significant chances of societal collapse due to climate change in certain areas plus civil unrest by mid 2030-2040, so ill say if its going to happen any time soon, itd be then
I remember back in 2015-16 when a report was released by Langley that basically spelled out that they were expecting the environment and economy to collapse, and the plan was to keep adding cops.
Back then I was like damn, but now I wish I saved it somewhere because that shit has been scrubbed or buried.
In addition to what others have answered, Gwynne Dyer's talk Geopolitics in a Hotter World talks a fair bit about this too. Most governments are preparing for climate unrest in the coming decades.