‘Executives of some of the world\u2019s biggest oil and gas companies \u2014 Exxon Mobil, Chevron, BP and Shell \u2014 are set to appear before a congressional committee Thursday to address accusations that the industry spent millions of dollars to wage a decades-long disinformation campaign to cast doubt on the science of climate change and to derail action to reduce emissions from burning fossil fuels.’<\/p>\n