U.S. President Barack Obama (L) and Vice President Joseph Biden walk toward the Oval Office at the White House in Washington September 8, 2009.    REUTERS/Larry Downing By Jeff Mason
WASHINGTON, Sept 8 (Reuters) – U.S. President Barack Obama laid out a broad vision on Tuesday for the upcoming G20 meeting he will host, saying the world’s biggest economies must “lay the groundwork” for sustainable economic growth in the future.

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