Canada should use the upcoming Summit of the Americas in Quebec City to hammer home its opposition to U.S. plans to open up Alaska's Arctic National Wildlife Refuge to oil drilling, the World Wildlife Fund said yesterday. The WWF said any development in the 19-million-acre (7.7-million-hectare) refuge would harm the region's Porcupine caribou herd and the native Gwich'in people who depend on it, and the group enlisted former Canadian Prime Minister John Turner to help spread its message.