AP Photo

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...