Irresponsible Trump, responsible China: that is the message the BBC’s climate editor seemed to be sending us by juxtaposing the news that the President had repealed Barack Obama’s “endangerment finding” and that China’s carbon emissions fell slightly last year. Trump’s critics like to portray him as a rogue figure in a world which is otherwise committed to reaching net-zero greenhouse gas emissions. But is there any truth in that? The endangerment finding was a piece of legalese issued in a 2009 ruling by the Environmental Protection Agency (EPA). It stated that six greenhouse gases – carbon dioxide, methane, nitrous oxide,...