In a surprising move, Exxon Mobil Corp (NYSE:XOM) has taken legal action against its investors. The company is seeking to block a climate proposal from being voted on at its upcoming shareholder meeting. What Happened: Exxon filed a lawsuit in a Texas court on Sunday to prevent a climate proposal, backed by activist investors, from being put to vote at its May shareholder meeting, Reuters reported. This is the first time Exxon has resorted to legal action to exclude a shareholder proposal. The investors, led by U.S. activist investment firm Arjuna Capital and shareholder activist group Follow …