Guardian: Some of the mightiest rivers on the planet, including the Ganges, the Niger, and the Yellow river in China, are drying up because of climate change, a study of global waterways warned yesterday. The study by the National Centre for Atmospheric Research in Colorado found that global warming has had a far more damaging impact on rivers than had been realised and that, overwhelmingly, those rivers in highly populated areas were the most severely affected. That could threaten food and …