The Sound Green

One thing I often notice while looking out in the water of the Puget Sound while riding the ferry are the unnatural streaks left behind in the water. The streaks are a result of boats and ferries that help thousands of Puget Sound residents commute everyday. My concern is, are we as a society ignorant of the constant damage caused by using the ferries because of the convenience that it provides for us everyday? I think it would be interesting if there isn't already to have a system similar to a carbon emission tax for the ferries as well, because boat travel does indeed leave an imprint on the environment. Boating commuting I believe could have similar implications on the water ecology as CO2 does on climate change and the environment.