China’s bird tourism boom sparks calls for regulation

In 2006, John O’Connor, a family physician in Fort Chipewyan, Alberta, noticed something strange: three people in the area, with its 1,200 residents, had cholangiocarcinoma – bile duct cancer.Bile duct cancer⁠ is rare, with only about 600 cases diagnosed in Canada each year. But in this town, located downstream from the Alberta oil sands, O’Connor was seeing rates that were far higher than expecte