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Most of the waste we produce on land eventually reaches the sea, through deliberate dumping or from run off through drains and rivers. Oil spills cause harm to the marine environment – but are only responsible for about 12 % of the oil running into the sea each year. Solid garbage also finds its way to the sea. Plastic bags are often found the airways of many marine species including whales, dolphins, seals and turtles. Also, approximately 80 % of urban discharged into the Mediterranean Sea is untreated or under treated. Tiny animals such as plankton absorb these chemicals before being eaten by fish.