Greenlighting Trade: A Trade Corridors Atlas, written by Senior Researcher Russ Kuykendall, explains the "big idea" behind trade corridors. The study argues that the six largest sectors of Canada's export trade to the United States illustrate the usefulness of trade corridors. The Atlas proposes concrete next steps, to thinking about the movement of trade in North America. Finally it proposes a philosophical framework grounded in the idea of "sphere sovereignty" that informs our development of trade corridors and that suggests trade requires the active participation of institutions, organizations and associations. Trade and trade corridors cannot be framed by government-to-government relationships alone.