The scientists of Canada are revolting. They marched through Ottawa in their thousands on Tuesday, a sea of white coats making its way up Parliament Hill, carrying tombstones and a coffin to symbolise the “death of evidence”, chanting “What do we want? SCIENCE! When do we want it? After peer review!”

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There have been mumbles that science in Canada was more than usually difficult for a while. In February, there were reports that scientists had won a historic battle when, in a private meeting on the impact of oil sands extraction in Alberta, they’d stood up for independent pollution monitoring.

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BBC correspondent Pallab Ghosh, visiting Vancouver for the annual American Association for the Advancement of Science (AAAS) meeting, wrote of scientists being “muzzled” by the Stephen Harper government, especially when it came to climate change.

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