A shrinking reservoir signals Ukraine and Russia are waging a dangerous water war. The headline is a bit misleading, since only one country is waging war on anything. But the underlying story is vital to keep in mind. The fight for resources, especially water, will be a geopolitical focal point of this century.

+ A quarter of world population lacks safe drinking water. And the situation is expected to get worse. Number of city dwellers lacking safe water to double by 2050.