Exxon’s official position has long been the same—a carbon tax is the best way to… Exxon Mobil Corp. XOM 1.70 % is ramping up its lobbying of other energy companies to support a carbon tax, marking a shift in the oil giant’s approach to climate change as the industry faces growing pressure to address the politically charged issue. Exxon’s official position has long been the same—a carbon tax is the best way to address the risks of warming temperatures—but it has done little to actively advocate for that goal in recent years. Lately, Exxon has been making the case with its U.S. counterparts to support a carbon tax, arguing that the industry must not oppose all climate policies, according to people familiar with Exxon’s thinking. Top Exxon officials have been more vocal about their support for a carbon tax and have met with Capitol Hill offices about related legislation, […]