This Olympics will make history for an uncomfortable reason: It will be the first winter games where basically all the snow used will be man-made. Past Olympics have needed snow machines to varying degrees, but never before to make all the snow. It's a sign of the times as a warming planet makes snowfall less reliable—but what does it mean for the future of the Olympics, and winter sports in general?

GUEST: Kathryn Blaze Baum, environment reporter, The Globe and Mail

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