Waterways made navigable by melting Arctic ice pose a security threat to the northern U.S. border, says the Pentagon. The shrinking ice cap has led to increased interest in tourism and energy development in the Arctic, and the extra traffic makes the Pentagon wary. “The Arctic is a new area that is important to us because of the changes in ice flows,” says Air Force General Gene Renuart. The Defense Department intends to beef up both its maritime and aerial surveillance of the northern border.
