Guardian: A global campaign in the style of Make Poverty History is needed to pressure political leaders into sealing a treaty on tackling climate change, Ed Miliband, the environment secretary, has said. Miliband told the Guardian a “popular mobilisation” was needed to help politicians push through an agreement to limit carbon emissions in the face of concerns about the economy. “There will be some people saying ‘we can’t go ahead with an agreement on climate change, it’s not the biggest …