L’AQUILA, Italy — The world’s major industrial nations and emerging powers failed to agree Wednesday on significant cuts in heat-trapping gases by 2050, unraveling an effort to build a global consensus to fight climate change, according to people following the talks As Obama arrived for three days of meetings with other international leaders, negotiators dropped a proposal that would have committed the world to reducing greenhouse gas emissions by 50 percent by midcentury and industrialized countries to slashing their emissions by 80 percent.
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