Not only the industry produces sewage which flows in the sea. Each of us uses the sea directly or indirectly as a rubbish bin. Our task is to limit the amount and the kind of rubbish. Most of the substances conducting into the sea cannot be reused or broken down by nature and cause soiling, destruction and in the end death of the seas.

The marine protection organization Oceana estimates that worldwide every hour about 675 tonnes of waste gets thrown directly into the oceans, half of it is made out of plastic. The extent of pollution can be judged best between Hawaii and California.
The so called "Great Pacific Garbage Patch" or "Eastern Garbage Patch" circles there which is a huge carpet of rubbish of more than three million tonnes of plastic - on an area as big as Central Europe.

A cigarette filter for example needs 200 years to be biologically degraded by nature. They are very poisonous and can get swallowed by fish what they won't survive. Cigarette filters do not belong into the sea.