Edie: When it comes to cutting carbon the scale of the problem is even greater than widely believed and humankind has just 40 years to go carbon neutral or face catastrophic consequences, according to a US think tank. The apocalyptic predictions put forward in the latest offering from the Worldwatch Institute, State of the World 2009: Into a Warming World aren’t the rantings of a militant fringe organisation but the studied findings of a relatively moderate Washington-based think …