Canada's blood supply has taken a hit this summer, due in part to B.C. wildfires, and Albertans are being urged to step up and help fill the void.A number of unprecedented events across the country have resulted in fewer blood donations, during what is already typically a slow season, according to Canadian Blood Services."We expected to see lower attendance in the summer months when regular donors take summer vacations, but the extraordinary natural events across the country presented unpredicte