At some point, there'll be the sufficiently direct negative feedback from nature to humanity which will slow and eventually halt the destruction ... but ... it'll probably take a while until then.
I'd say 2035-2040 until we see politicians in the democratic states make decisions that are painful for citizens and effective enough to notably slow the destruction. (I have a feeling that China will get there earlier, say 2030 or so.)
I sincerely doubt there will be any meaningful democracies left by 2040 :) People always trend towards strong leaders and authoritarianism in the face of crisis, and there will be oh so many crises...
Additionally, much of the modern conservative movement (around the world) is centered around personality worship and anti-democratization of power structures and are trying very hard to move their democracies toward autocracy favoring a cultural or ethnic in-group.
Wikipedia has a much more extensive list, along with various things that contribute to it: