There has been, for some time, a large degree of consensus over the fact that the best long-term policy to reduce the greenhouse gas emissions causing climate change, at the least overall cost to the economy, is one that would place a price on those emissions. Globally, "green" public spending has exploded and a "low carbon investment gap" has opened up, and the absence of a national Canadian carbon policy is becoming a competitive disadvantage for Canada. This document examines how public investment incents action, and looks at the different financing options available.