The West wants Iran to stop its nuclear weapons program, stop being a state sponsor of terrorism and sell the West it's oil. Iran wants trade and solving its water shortage problem as it is in the midst of a 20-year drought that makes California look like the rain forest. There are two ways this water shortage gets addressed: More water and/or less demand for water. The first is pretty much outside anyone's influence. The second can be addressed with technology lessening the demand, particularly in industries needing water for cooling operations. The West possesses this technology.