Former US vice president Al Gore took a swipe at global warming doubters Saturday as he opened the Washington leg of the worldwide Live Earth concerts that he helped organize.
Washington was a last-minute addition to the global event months after organizers failed to find a space on the US capital's National Mall, a sprawling green space featuring monuments including the Congress building.
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"Some who don't understand what is now at stake tried to stop this event on the Mall," the former Democratic presidential candidate said in a thinly veiled hit on members of President George W. Bush's Republican party.
"But here we are," he said as an image of a bright Earth shined behind him. "And it wasn't the cavalry who came to our rescue, it was the American Indian."
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