World leaders had one more security issue to worry about as they gathered in the Canadian Rockies this week for the G7 summit - grizzly bears. In the weeks leading up to the annual gathering authorities were hard at work fortifying a lodge in Kananaskis, Alberta, not just from the usual threats, but also the local wildlife. Buffaloberry bushes - popular with bears - were removed from around the venue, eight-foot electric fences installed to keep the predators at a safe distance, and drones

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