That's an excellent question, Mrs. Desbiens.
The greater the risk of spills of any kind, the greater the danger to the St. Lawrence River. However, the more prevention is done to prevent spills from occurring, the lower the risk to the St. Lawrence River.
There is no doubt that the production of goods is on the rise, and shipping is increasing accordingly. We must not forget that the goods produced are transported from one country to another and that ships discharge their wastewater into the waters they use. This also has an impact on the St. Lawrence River, but that is another issue.
The St. Lawrence is obviously at greater risk than before due to increased shipping. That's the only answer I can give you.