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The global warming of the Earth climate is already causing heavy effects and one of them is surely particularly harmful for local populations; the temperate, tropical and equatorial regions are becoming drier and drier. This means less rains and moisture in the basin of the longest rivers of the world, like Nile, Niger, Hindus, Tigris and the Euphrates Rivers and even the equatorial Congo and Amazonas Rivers.

This will not cause the death of these rivers because "death" means a river becomes permanently dry for the whole year or nearly and also its sources become dry, as it happened in deserts. The great rivers, instead, will reduce their average water flow even drastically during the year, with total dryness during the hottest and driest periods and violent floods, during short periods. These rivers will not die, but will become ill, more or less seriously.

This is not a great relief, in any case; this situation will be enough to cause a lot of dramatic problems in the regions included within the basin of these rivers, with changes that will be very hard to face, just because occurring within few years.

Last year, just the Amazon River, in South America, knew a never seen dryness that reduced the longest river of the world after the Nile (its banks were distant up to 1-2 km) to a stream few tens of metres wide, in some points.
Manaus, the largest town of the Amazon region, in Brazil, was totally insulated because boats and ships couldn't move anymore and were all aground. Many aquatic animals, used to water abundance, died and caused great environmental problems.

In the temperate regions, the increased variability of water flows during the year is enhanced by the reduction of rains and snow falls and also by the withdrawal or disappearing of glaciers in the mountains where rivers have their sources like in the Alps, Rocky Mountains, Andes, Himalaya, Caucasus, Atlantes. Glaciers, to be defined so, must be present all the year (although with a seasonal and cyclic minimum in summer) and can guarantee a relative constancy in rivers flow during the year. also in the hottest season.

If the glaciers of the main mountain ranges of the world will keep on reducing so quickly, until disappearing, the most important rivers of Central Europe, Asia and America, like the Rhine, the Rhone, the Po, the Danube, the Mississippi, the Colorado and the main Chinese and Indian rivers will not die, but they will change their nature becoming highly seasonal, fed only by rains, when these

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