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Oceans in Crisis

Oceans in Crisis. CGF3M Nov. 29, 2013. Oceans in Crisis. Listen to this TED Talk by Oceanographer Dr. Sylvia Earle about why we need to protect the oceans now- before it is too late. Threat #1: Acidification. Linked to high levels of carbon dioxide in the atmosphere

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Oceans in Crisis

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  1. Oceans in Crisis CGF3M Nov. 29, 2013

  2. Oceans in Crisis • Listen to this TED Talk by Oceanographer Dr. Sylvia Earle about why we need to protect the oceans now- before it is too late.

  3. Threat #1: Acidification • Linked to high levels of carbon dioxide in the atmosphere • We are changing the pH of the oceans when we burn fossil fuels • The ocean is 30% more acidic today • As the ocean becomes more acidic, it corrodes surfaces and organisms- coral reefs are most sensitive • 407 dead zones in the global oceans

  4. Threat #2: Garbage • VIDEO • See reading from yesterday • Plastics and other garbage that is non-biodegradable are filling the oceans, and accumulate in gyres • 1 million seabirds choke on or get tangled in plastic or other debris every year • Marine litter releases toxic chemicals into the ocean • Nurdles (tiny pieces of plastic) are eaten by fish and passed along the food chain • VIDEO 2

  5. Threat #3: Overfishing • The population of predator fish in the ocean has declined by 90% since the 1950s • As larger species die out, we target fish lower on the food chain • Humans have recently turned to aquaculture (fish farming) as a solution • Canadian fish stocks are starting to bounce back after being nearly depleted in the 1990s

  6. Threat #4: Pollution • About 80% of ocean pollution originates on land • Sewage, oil spolls, agricultural runoff • Container ships lose an estimated 10 000 containers at sea each year, usually during storms • Cruise ships dump their waste (including raw sewage) at sea

  7. In the News… • Fabien Cousteau (grandson of famous ocean explorer Jacques Cousteau) will be living underwater for 31 days this spring- see how HERE.

  8. Reminder! • Unit 2 test is on TUESDAY • Rivers • Glaciers • Oceans

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