* U.S. should set 2020 cuts even if Senate has not set goal
* UN, EU say urge U.S. to do more to help Copenhagen pact
* U.S. says working hard, with Congress
BARCELONA, Spain, Nov 2 (Reuters) – The United States should set a 2020 goal for cutting greenhouse gases to help rescue a U.N. climate deal due next month in Copenhagen, the United Nations said at a final preparatory meeting on Monday.
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