Dirty energy behemoth ExxonMobil is buying a Texas oil company called Pioneer Natural Resources for $60 billion. As part of approving the deal, officials at the Federal Trade Commission (FTC) have barred Pioneer’s former CEO, Scott Sheffield, from serving on the board of ExxonMobil because he allegedly tried to collude with OPEC — the Organization of the Petroleum Exporting Countries — to inflate oil and gas prices, harming millions upon millions of American consumers.