An unusually broad coalition of 12 U.S. environmental and public-interest groups Tuesday launched a national boycott of ExxonMobil, the world's largest oil company, for undermining efforts to combat global warming...The campaign, called ”ExxposeExxon.com,” also wants to exert pressure on the company...to invest more money in clean and renewable sources of energy, as a number of its competitors, such as BP and Shell, have done in recent years...In a statement, ExxonMobil said it was indeed developing technologies to reduce greenhouse gas emissions that most scientists believe contribute to global warming. [also refers to ChevronTexaco (Chevron)]