New Scientist: HAVE scientists muddied the waters over what needs to be done to stave off dangerous climate change? Have they caused confusion instead of telling politicians how to save the world? That’s what many are asking in the wake of a major meeting intended to inform politicians before vitally important negotiations later this year. This December, the Bella Centre in Copenhagen, Denmark, will play host to thousands of politicians, policy-makers and their entourage as they try to agree on …