ESS: Why are hospitals in Calgary being asked to conserve oxygen?

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In Calgary, AB, a memo went out to some hospitals, asking staff to "engage in oxygen conservation" as COVID-19 cases rise. Evan Solomon talks about this memo and what it means with Dr. Joe Vipond, an emergency room physician at Rockyview General Hospital in Calgary and co-founder of Masks4Canada.  Listen to The Evan Solomon Show podcast on the iHeart radio app, Apple Podcasts, Spotify, or wherever you listen to your podcasts.