Less blunt version: The BBC Trust has looked at its coverage of science and concluded that there was a problem: when news and current affairs presenters are covering science issues and don't have enough knowledge of what's going on, they may create false impartiality by "presenting the views of tiny and unqualified minorities as if they have the same weight as the scientific consensus."
More blunt version, from our friends at The Telegraph: "stop inviting cranks onto science programmes."
There's a lot more in here, because simply telling reporters not to do that is useless if they don't have a way to know when one side is a nutty fringe group and when there's a genuine lack of consensus. The BBC has been sending its executives to workshops, talking to wide ranges of experts in many fields, and creating long-term channels for BBC reporters and executives to have access to a genuinely wide range of experts. (Full report: http://downloads.bbc.co.uk/bbctrust/assets/files/pdf/our_work/science_impartiality/trust_conclusions.pdf
Overall, I'd say this is a great move on the BBC's part, and now I only hope that many other news organizations around the world follow suit.
h/t +Christine Paluch