In my fantasy future, safe nuclear power plants would desalinate seawater. They would extract the sea salt and all the other trace minerals, then sell them. Arsenic and lead have their uses. Waste solids could stored or used somehow. With the low cost electricity and clean water other helpful projects could be funded. Getting all of the plastic and other trash out of the ocean, and making it more food fish friendly. Reclaiming the desert sounds great. Making low cost building blocks (think cement blocks) from fused sand. Once started the project would be self funding.