Signals of past say big droughts can hit U.S. east

(PhysOrg.com) -- Scientists examining rings from old trees spanning the last 400 years say they show that the U.S. East Coast has suffered droughts longer and more frequent than anything recorded in modern times. With large cities like New York and Atlanta struggling in recent years to maintain water supplies during dry spells, the findings suggest such cities may be in for much worse times, should such conditions return. The study was presented this week at a conference in Santa Fe, N.M., sponsored by the American Geophysical Union.

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