Iran didn't react to the release of the report, a copy of which was submitted to the government in January in accordance with U.N. protocol.

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The EU has also reduced its overall greenhouse-gas emissions to meet requirements of the Kyoto Protocol, a U.N. compact adopted in 2005 which the U.S. hasn't signed.

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But, even setting aside the difficulties of learning how to run a retail business, such a site would face problems of protocol worthy of the U.N.

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The Kyoto Protocol, despite its shortcomings, is the closest thing to an effective international treaty that has emerged from U.N. climate talks.

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