Speakers at a major science meeting being held in Canada said communication of vital research on health and environment issues is being suppressed. Prof Thomas Pedersen, a senior scientist at the University of Victoria, said he believed there was a political motive in some cases. The Canadian government recently withdrew from the Kyoto protocol to reduce carbon dioxide emissions. The allegation of muzzling" came up at a session of the AAAS meeting to discuss the impact of a media protocol introduced by the Conservative government shortly after it was elected in 2008. The protocol requires that all interview requests for scientists employed by the government must first be cleared by officials. A decision as to whether to allow the interview can take several days, which can prevent government scientists commenting on breaking news stories. Sources say that requests are often refused and when interviews are granted, government media relations officials can and do ask for written questions to be submitted in advance and elect to sit in on the interview. Andrew Weaver, an environmental scientist at the University of Victoria in British Columbia, described the protocol as "Orwellian". Professor Weaver said that information is so tightly controlled that the public is "left in the dark"."The only information they are given is that which the government wants, which will then allow a supporting of a particular agenda," he said.