As the U.N. climate change meetings meander on in Durban, South Africa, with little sign of major breakthrough -- and soon after newsthat the last year saw the largest rise in carbon emissions in history -- it is a good time to think about how to deal with some of the impacts of a global warming that appear increasingly inevitable. One big impact involves water -- both that there's soon going to be too much of the salty stuff subsuming low lying areas as the ice caps melt, and too little elsewhere. A warmer world will be wetter overall, but current models predict that climate change will make some dry parts of the planet -- Northern Africa, for one -- even drier. Many of the places are already the very regions suffering from the greatest shortages. Even without climate change, global patterns of water usage are unsustainable, but global warming is a big reason to start using the stuff with greater care. The simplest way to encourage that? Make people pay for it.