SciDev.Net: Bluish colours indicate where river flow has increased since 1948 and reddish colours where it has decreased. Some of the developing world’s largest rivers are drying up because of climate change, threatening water supplies in some of the most populous places on Earth, say scientists. Researchers from the US-based National Center for Atmospheric Research (NCAR) analysed data combined with computer models to assess flow in 925 rivers — nearly three quarters of the world’s …