Guardian: Scientists are taking an increasingly political stance towards action on climate change. In 2005, the science academies of the G8 countries, plus China, India and Brazil, collectively called for governments to place climate change at the top of the international agenda. By 2008 they were calling for a planned transition to a low-carbon economy. Similarly, this week’s international climate change conference in Copenhagen, at which I am speaking, is deliberately organised to try to influence …