The largest rivers of world wither

Have you already seen the Yellow River in China, the Ganga in India and Niger in Africa?

Can it be that until they decide to visit, will no longer exist in its current form. These alarming reports mediated to the world National Center for atmospheric Research (NCAR) in Colorado U.S. Scientists have found that global warming has an increasing impact on water flows. Most at risk are densely populated areas of large rivers in the subtropics, where is the danger of thirst and famine. By examining the available data from 925 rivers flows from 1948 to the year 2004 brought shocking results.
Up to one third of large rivers is directly threatened by global warming and about 500 rivers is now much weaker than the flow of water in the past.