WPP accused of breaching its climate policy after report reveals firm linked to twice as much oil advertising as US rivals A British advertising conglomerate has helped the oil companies ExxonMobil, Chevron, Shell and BP spend an estimated $1.5bn (£1.1bn) on adverts in the US since the 2015 Paris agreement to tackle the climate crisis, a report shows. London-based WPP was the leading advertising group serving the US’s oil industry over the past decade, according to analysis by the climate inv...