Look don’t let Environmentalist blow smoke up your azz!! It’s not the human discharged waist that’s an issue it’s plastic, chemicals, trash in general that leaves an impact human waist breaks down so fast it’s nothing compared to what’s coming down the rivers of populated land living areas! There’s no comparison what so ever a few boaters living on the water and millions living close to the water shed. I know it sound gross but where do whales go? Do they pull up to a marina and get a pump out? If so get ready to take on 4 tons of waist a day