Over the last few years, the government of Canada — led by Stephen Harper — has made it harder and harder for publicly financed scientists to communicate with the public and with other scientists.

It began badly enough in 2008 when scientists working for Environment Canada, the federal agency, were told to refer all queries to departmental communications officers. Now the government is doing all it can to monitor and restrict the flow of scientific information, especially concerning research into climate change, fisheries and anything to do with the Alberta tar sands — source of the diluted bitumen that would flow through the controversial Keystone XL pipeline. Journalists find themselves unable to reach government scientists; the scientists themselves have organized public protests.

There was trouble of this kind here in the George W. Bush years, when scientists were asked to toe the party line on climate policy and endangered species. But nothing came close to what is being done in Canada.

Science is the gathering of hypotheses and the endless testing of them. It involves checking and double-checking, self-criticism and a willingness to overturn even fundamental assumptions if they prove to be wrong. But none of this can happen without open communication among scientists. This is more than an attack on academic freedom. It is an attempt to guarantee public ignorance.