Cures both the water crisis and climate crisis while also allowing unlimited population growth with increased consumption expectations across the planet?

Riiiiight.

Why not? Both water shortage and greenhouse gas emissions are because of our lacking energy technology. Get better energy tech and we solve both.

Go modern nuclear.

This depends what you mean by 'solutions'. Burning resources of the planet is not a solution, it's a delay tactic that is only buying you time. Nuclear has it's own host of problems, even the modern ones.

The problems of nuclear are dramatically overblown, particularly nuclear waste.

In the sense that one might read palms among the vast array of waving hands, yes.