A group of ExxonMobil shareholders, including large public US pension funds, said Wednesday they planned to raise the heat on oil giant ExxonMobil over its climate change policies. The investors…said they would seek to reform ExxonMobil's position on global warming at the annual shareholder meeting on May 30. "ExxonMobil's go-slow approach on renewables, its resistance to a strong national climate policy and its campaign to muddy the waters on climate science is troubling to investors," said California state controller and CalSTRS board member John Chiang…Gantt Walton, an ExxonMobil spokesman, said the company disagreed with the investors' criticism and said ExxonMobil was moving to improve its energy efficiency while also seeking to cut its greenhouse gas emissions…