By February, Canadians’ love of fresh snow and winter sports has given way to annoyance, as we shovel our driveways for the umpteenth time. This winter, we’ve had some particularly nasty weather. But far colder and much nastier winters could be in store for us, especially for eastern Canadians and perhaps very soon. The culprit, weirdly enough, could be global warming.

with Karl Braganza, David Karoly and James Risbey | Complex issues like climate change are surrounded by a dense tangle of scientific theory and evidence that is difficult for any non-specialist to verify or understand. People can exploit this situation to tell very different stories about the issue. Because countless bits of evidence are available, it’s possible – by selecting and connecting the bits carefully – to construct practically any picture of the world and make it seem real.

When a Russian icebreaker arrived at the North Pole a few weeks ago carrying a load of tourists, it found a mile-wide patch of ice-free water. It seemed like an astonishing development: indeed, reporter John Noble Wilford wrote in a front page story in the New York Times that “the last time scientists can be certain the pole was awash in water was more than 50 million years ago.” Here, it appeared, was bold evidence that global warming is finally upon us.