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Canada will host more than a dozen world leaders at the Group of Seven summit in Kananaskis, Alta., starting on Sunday, with several pressing issues at stake both on and off the agenda.There are seven member states in the informal grouping of some of the world’s most advanced economies, and five have new leaders since last year, including Canada. But in addition to those nations, the host also typically invites leaders from other countries and organizations to shape discussions and encourage global co-operation.