WASHINGTON, Nov 20 (Reuters) - U.S. economic and political clout will decline over the next two decades and the world will grow more dangerous, with food and water scarce and weapons in abundance, U.S. intelligence agencies projected on Thursday.

The National Intelligence Council analysis "Global Trends 2025" said the current financial crisis on Wall Street is the beginning of a global economic rebalancing, and the U.S. dollar's role as the major world currency will weaken to the point where it becomes a "first among equals."

The report is based on a global survey of experts and trends by U.S. intelligence analysts. (Reporting by Randall Mikkelsen; Editing by Kristin Roberts)

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