Generalization: most of those problems are political rather than technical, and unlike with technical problems, if you make a wrong guess about how to solve a political problem, the costs might be unboundedly catastrophic (e.g. world war).
I personally believe that the best response to global warming is open borders, because it would mean that all the people who:
* are living in the global south could relocate somewhere colder and further inland, if they wanted;
* are subsistence farming, but who would be great engineers, scientists, etc. given the right opportunities, would be more likely to get those opportunities.
Most people think that open borders would be bad, and I don't think I will be able to persuade them otherwise in my lifetime.
In general, alternatives to persuasion in politics amount to seizing power and/or changing the rules of the game. Even if I thought I could do that, which I don't, I wouldn't, because all too often in history, the cure is worse than the disease.
That's why I think these problems are hard -- and why I'm scared of people who propose grand solutions to them.