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Lecutre 8 enviro sci.docx

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Department
Earth Sciences
Course
EARTHSC 2EI3
Professor
David Goutor
Semester
Fall

Description
Impacts On Marine Ecosystems  Offshore drilling: greater then 60% of current oil production  Toxins in drill mud  Deep-water Horizion,2010 Costal Zones Development  50% of the world’s population lives: less than 100km from the coast Eg. Destruction of coastal wetlands  No legislation in 50% of countries with coastline Collapse of Cod Fisheries  Summer  Catch in late 1950s; ~150,000 tonnes  1974: 35,000 tonnes  1977 ; Canada declare a 200- nautical mile; exclusive fishing zone off its coasts  After 1992 people were reporting cod fish were smaller then befre  DFO: still a lot of fish  1986 massive drop in landings after it  Fishing of cod was banned in 1993 after they released their was no cod anymore.  Now: endangered speces (north Atlantic cod) Pollution  Main sources of marine toxicants in Canada:  Airborne pollutants  Agricultural runoff  Sewage  Waste from refineries  Bioaccumulation & bio magnifi
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