Tribal rainmakers may soon be out of a job if an invention by a Scotish-based scientist proves economically viable. The device, which uses wind turbines to such water out of the oceans, could end droughts around the world and compensate for a predicted rise in sea level caused by ocean warming, it is claimed. Stephen Salter has calculated that hundreds or even thousands of the machines in hot areas of the world could make enough rain to prevent droughts.