1. The evangelicals have been for decades sending funds intended for Israel’s takeover of Palestine, hoping that would trigger an Armageddon (aka: planetary extinction event) and the second coming of Christ. I see no uniting of humanity against homicidal religions, more like the opposite.
2. Climate change is a multi-century thing. It requires no unified response, just an “each one find their own way to conquer a piece of Antarctica” and kill everyone else in their way.
3. Elites have both nukes and nuclear shelters, they wouldn’t be the ones on the losing end of a worldwide revolution.

The closest thing to a planetary threat, is giving control of the military to some AI… but given that several countries are already working on that, the more likely outcome is for everyone to get killed by everyone else, before anyone can unite.