Independent: Since the turn of this century, the US south-west has spent more than a decade in drought. Last year was the warmest on record in California, which is in the middle of its driest spell for more than 400 years. But according to a new scientific study, that's nothing compared to what comes next.
In the paper, published by the journal Science Advances, researchers from Nasa and Columbia and Cornell universities warn that a vast swathe of the US, including the south-west states and the central plains,...