Andy Revkin has the scoop on a letter from the IPCC (very misguided, to my mind) advising its scientists against having media contacts. An IPCC scientist, Edward R. Carr, also thinks this is a very bad idea. More specifically, IPCC chair Rajendra Pachauri wrote this to researchers:
I would also like to emphasize that enhanced media interest in the work of the IPCC would probably subject you to queries about your work and the IPCC. My sincere advice would be that you keep a distance from the media and should any questions be asked about the Working Group with which you are associated, please direct such media questions to the Co-chairs of your Working Group and for any questions regarding the IPCC to the secretariat of the IPCC. What Pachauri's letter should have said is the following:
I would also like to emphasize that enhanced media interest in the work of the IPCC would probably subject you to queries about your work and the IPCC. For this reason, the IPCC has developed a number of tip sheets, trainings, and other content to help scientists who may receive queries from the media. We also have several trained media consultants available at any time to answer your questions about the ...