$6 billion would buy a whole lot of desalinization. Just saying.
New Israeli desalination plant produces 627,000 cubic meters of fresh water per day at a cost of 500 million dollars to build. With 6 billion dollars 12 such plants could be built which would produce about 7.5 million cubic meters of fresh water per day. The downside is that it would take 10 billion dollars in legal expenses and 20 years of legal action to pick the eco-lice off the project. By the way 7.5 million cubic meters is about 6080 acre feet, and that’s a lot of feet, nearly 10 square miles a foot deep.