Earlier this month, the world's largest PR firm Edelman ended its decade-long relationship with the world's largest oil lobby, the American Petroleum Institute (API). A welcome step, and high time too, as climate change activists would likely assert. API's contracts with Edelman had been big; so massive that it amounted to 10 per cent of the PR firm's revenues. Its Blue Advertising subsidiary helped API run commercials that promoted the idea that oil and gas were plentiful, and were viable too...