The five biggest oil companies — Exxon Mobil Corp., Royal Dutch Shell Plc, Chevron Corp., BP Plc and Total SA — collectively curbed their pollution by an average of 13 percent between 2010 and 2015, the report said. BP cut the most at 25.5 percent. Exxon, the largest emitter among listed companies, pushed it down by 14 percent. FULL ARTICLE
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