Climatic changes are really only starting to be felt when the game shifts focus from Europe. There was no real need to detail what was going on there, but GMs are certainly free to apply similar upheavals.
PCs can't do anything about the climate, that's far beyond the scope of the game. Only massive civil engineering projects will help there (new dams, railroads and other similar infrastructure). They can however be very effective as "trouble shooters", such as in Kidnapped where they're tasked to essentially clear the way for the Civgov relocation. Another example is Satellite Down where their recovery of the weather data will give the authorities a massive assist in planning how to deal with the next few years.
Failure in their mission(s) would help tip the world (or at least the world as far as they're concerned) over the brink.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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