Very briefly, there was some concern by the Bloc and others that when you use the word “national”, it sometimes implies that there has to be some kind of coordinated effect with the provinces. This limits the effect of the bill to the operations of the federal government within its own sphere.
Evidence of meeting #32 for Environment and Sustainable Development in the 39th Parliament, 2nd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was godfrey.
A recording is available from Parliament.