GEOG 2EI3 Lecture 7: Oceans and Fisheries
25 Jan 2019
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Document Summary
, but before carbonic acid is formed us food. Increased acid levels in water level are impacting businesses in bc: scallops are dying before maturity due to lethal levels of acid, lost 95% of harvest, rising acidity in oceans is a global problem, oceans are absorbing co2. World hypoxic and eutrophic coastal areas: hypoxic zones in bottom waters, hinder development of fish, problem worldwide, atrophic can potentially become hypoxic too. Impacts on marine ecosystems: offshore drilling: >60% of current oil production, toxins in drill mud, deepwater horizon, 2010. Increasing pollutions too: around 50% of the world"s population lives: less than 100km from the coast, e. g. Collapse of the cod fisheries: massive fishing ground, catch in the late 1950s: approx. 150,000 tonnes: 1974: 35,000 tonnes, 1977; canada declared a 200-nautical mile: exclusive fishing zone off its coasts, 1933: cod fishing banned. : for aboriginals in the arctic: contamination of their food supply.
