Exxon Mobil Worth Tops $500 Billion

World's Largest Oil Company Has Been Fighting Global Warming Regulation Exxon Mobil Corp. hit a new milestone with the disclosure that it is now worth more than half a trillion dollars. The oil giant is flush from its control over every aspect of pumping and delivering oil and gas. In the past, it has used a tiny fraction of that money to influence government and the public on the issue of global warming. Given oil's role in causing the heating of the atmosphere -- as an energy source, it's second only to coal, in terms of carbon content -- it's probably no surprise that Exxon's now well-known efforts were designed to obscure scientific consensus and prevent action on an issue that seems, by most credible accounts, to be growing ever more urgent. Exxon, of late, has insisted that it is not a "climate change denier" and that it wants to play a constructive role. There are about a half a trillion ways it could do that.