To the untrained eye, it looks like the major oil companies that helped get us into this whole climate mess — conglomerates like ExxonMobil, BP, and Shell — are starting to envision a world beyond fossil fuels. A few of them have launched their own campaigns charting a path to a greener future — and, surprisingly, even more have backed a carbon tax proposal. Is Big Oil trying to hasten its own demise, or are these companies just ensuring that they will dominate the energy sector for decades to come?ExxonMobil, Royal Dutch Shell, Chevron, BP, and Total have collectively spent more than a billion dollars on branding and lobbying since the signing of the Paris Agreement — the moment when the companies sensed a permanent turning of the tide against their industry. That’s according to a report published by the U.K.-based InfluenceMap, a group that analyzes climate policy lobbying.The report illuminates a two-pronged approach by Big Oil: While the companies market themselves as socially and environmentally conscious to the public, they’re actively working against climate regulations behind the scenes. Since the global climate accord’s adoption in late 2015, European-based Shell, Total, and BP — followed shortly thereafter by U.S.-based ExxonMobil and Chevron — “initiated a campaign of top-line positivity on climate,” the report said.