World's major rivers 'drying up'

Water levels in some of the world's most important rivers have declined significantly over the past 50 years, US researchers say.

They say the reduced flows are linked to climate change and will have a major impact as the human population grows.
The only area with a significant increase in water flows was the Arctic due to a greater snow and ice melting.
The study was published in the American Meteorological Society's (AMS) Journal of Climate.