New York Times: “Severe mental health problems are likely to surge, in the U.S. and elsewhere, unless Congress exerts dramatic leadership to help slow climate change – and soon,” began an e-mail message that found its way into my in-box last week. It came from a group called Psychologists for Social Responsibility. (I get a lot of e-mail messages.) “Many Americans are already anxious about what climate change portends,” the group wrote in a letter it had apparently sent to Congress. …