After coming beneath assault from each environmentalists and buyers within the first half of his seven-year tenure on the helm of Exxon Mobil Corp., Darren Woods is on the offensive.Already this 12 months, Woods filed an arbitration case towards Chevron Corp. for making an attempt to purchase into Exxon’s large offshore oil undertaking in Guyana and a lawsuit towards buyers demanding that his firm reduce emissions. Simply months earlier, he agreed to a $60 billion takeover that might make Exxon the largest US shale producer.