These two are the most important, the most critical. Energy and Water.
3. Cheap, Scalable Solar
7. Cheap Desalination
I think the future of solar is actually in space. The way to realize this would be to build a “seed plant” on the moon to harvest lunar material to build cheap solar arrays onthe moon to build more factories to build cheap orbial space based solar power plants that beam the energy back to earth via phased microwave power transfer.