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British advertising conglomerate WPP has helped oil companies ExxonMobil, Chevron, Shell, and BP spend an estimated $1 billion on ads in the United States since the 2015 Paris Agreement to tackle climate change, a new report shows. The figure is nearly twice the respective amounts linked to U.S. rivals Omnicom and Interpublic Group (IPG), which merged in November. London-based WPP was the