CANCUN, Mexico-Efforts to craft an agreement on protecting tropical for ests-long seen as likely the most "get-table" deal at this year's United Nations climate change summit-hit a wall this week over seemingly intractable differ ences among key nations on whether to allow market-based financing to support forest-protection efforts, how to protect the rights of indigenous forest popula tions and how to verify that forest-relat ed emissions cuts claimed by developing nations are real.
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