In a rumpled suit jacket and faded jeans, Giles Slade stands atop an earthen levee and looks out over a vast expanse of water. It’s mid-November, and the Fraser River runs gray and glasslike into the Salish Sea. Overhead, airplanes flash through low clouds, descending into Vancouver International Airport. To our backs is the city of Richmond, British Columbia, splayed out on the table-flat delta, the majority of its homes and buildings set just a few feet above sea level.