I would argue that most boat hulls do not have a significant environmental/ecological impact. Compared to cars, kitchen appliances, etc. a fiberglass boat hull may last for many decades before it must be replaced. Fuel burning motors could possibly be replaced with more sustainable energy. However, compared to the average speed boat, a typical sailor will use a fraction of the fuel in a season.
Maybe the largest ecological impact one could have in the marine industry is to convince more motor boaters to change to sailing.