Birds fly past at sun set as smoke emits from a chimney at a factory in Ahmadabad, India, Monday, Dec. 8, 2014. The momentum from a historic U.S.-China pact to resist global warming is showing signs of fading at the U.N. climate talks in Peru as the familiar rich-poor conflict persists over who should do what to keep the planet from overheating. The conference's high-level phase begins Tuesday. (AP Photo/Ajit Solanki)
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