Human society affect the water and water creatures. Some of the solution limited amount of dumping into to the sea, river, and lake. to have less ship cruzing near natural area and protecting movement for seals and penguens.
http://proquest.umi.com/pqdweb?did=422067971&sid=9&Fmt=3&clientId=27901&RQT=309&VName=PQD
http://proquest.umi.com/pqdweb?did=839631421&sid=9&Fmt=3&clientId=27901&RQT=309&VName=PQD
