Independent (UK): Back in April 2006, David Cameron handed out silver birch saplings to journalists at a press conference in which he urged voters to “vote blue, go green”. The next day, the Tory leader of four months was photographed perched on the melting Svalbard glacier in Norway, his hair windswept, an arm wrapped around a huskie which was nuzzling Cameron’s North Face jacket. These were the 24 hours in which Cameron imposed his environmental credentials on the world. They were followed by a pledge to …