Maybe I can elaborate. As Monsieur Ares explained, the test for fuels is “contribute significantly to air pollution”. So we have similarly limited the power to gather information about fuels to fuels that may contribute significantly to air pollution. But we didn't want to have that “contribute significantly to” as a qualifier for our authority to gather information about other sources of air pollution. Hence proposed paragraphs (g) and (g.1), the separation of the two.
That's part of your question. The second part is, why did we go to “substances or activities” instead of just sticking to substances?
As you know, the original CEPA, or certainly part 5, was focused on individual substances and the impacts of substances. When you get into air pollution, and more particularly when you get into greenhouse gas, in order to regulate effectively we believe it would be useful to have the authority to understand better the nature of the activities that are under way in Canada that are contributing to air pollution and not have to tie our information-gathering authorities to individual substances that we designate. So for example, this would let us look at and request information from fossil-fuel-fired, electricity-generating activities as opposed to designating the substances that are coming out of the stack and limiting our information-gathering authorities to those substances.
Does that help?