I would suggest a public registry where every authorization that DFO issues comes with a monitoring requirement, maybe not all of them, but many of them, and have that data coming.
In addition to that, DFO should partner with agencies that are actually doing some of this work, whether it's a study that was cited by the Canadian Wildlife Federation or the work being done by the World Wildlife Fund where they have mapped the threats and the health of watersheds in Canada right now. Go out there and do that baseline work, establish that baseline, and then, yes, sure, we can try to have that conversation.
I don't think four years is going to be enough. Changes in the environment usually take decades to detect. However, certainly we would have some kind of baseline, and we could be reasonably confident that we'll have that data when the time comes to make those reviews.