Guardian: Barack Obama will skip a United Nations summit billed as a “once in a generation opportunity” to make progress on global development, sending Hillary Clinton in his place.
The US state department announced on Tuesday that Clinton, as secretary of state, would lead America’s delebation to the Rio+20 global development summit next week.
She will be joined by the head of the Environmental Protection Agency, Lisa Jackson, and the White House environmental official Nancy Sutley, as well as state…

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