In Old English literature, the sea was poetically described as "The Swan Road" (Swanrad) and "The Whale Road" (Hwaelweg). Today, it would be more apt to describe the sea as "The Boat Road". In short, traffic on the waves is detrimental, (just like traffic in the air, and on the roads).
At the end of the day, at the start of each new day, pollution is a global issue.