LAURIE GOERING  AS growing populations and accelerating climate change worsen water scarcity around the world, pumping more from underground could help fill the gap in poorer nations - but only if supplies are better charted and they are used wisely, researchers said. "It's a resource with a huge amount of potential," said Jude Cobbing, who led a new study for charities WaterAid, Earthwatch and WWF on how groundwater is managed in India, Bangladesh, Nepal, Nigeria and Ghana. Little is understood about how much groundwater is available, particularly at local level, and poor organisation between government agencies can mean it does…