Evil twin of Climate Change

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Presentation transcript:

Evil twin of Climate Change Ocean Acidification Evil twin of Climate Change

What is Ocean Acidification ? click title for 3 min. video Human made carbon dioxide is being absorbed by the oceans making them approx. 30% more acidic so far The trends in the atmosphere and ocean have continued with CO2 now at 400 in the atmosphere and ocean pH lower

Why is this small change a Big Deal? Increased acidity will gradually dissolve the shells of many sea creatures essential to the food chain Experiment with water at the predicted 2100 acidity level these pterapods are an essential parts of the marine food chain in the Arctic Ocean

Historic and Projected Ocean pH Levels Time pH H+ change 18th Century 8.179 1990s 8.104 +18.9% Present 8.069 +28.8% 2050 7.949 +69.8% 2100 7.824 +126.5% The normal pH level for the ocean is above the neutral value of 7.0. Because the pH scale is logarithmic, changing from 8.2 to 7.2 would mean 10x more H+ ions, or 1000% change.

Problems are already occurring Oyster farms are experiencing failures. Experiments show that tiny reductions in pH reduce the amount of shell building carbonate in the water, making shell building much more difficult, especially for young larvae (baby shell fish) Click here for 6 min Oyster Farm Video

Marine Extinction 252 Million years ago This event killed 96% of marine life and 70% of land life. Causes are not fully known but included very strong greenhouse effect and ocean acidification. Temps increased 14 deg F and carbon dioxide reached 2000 ppm event included huge volcanic eruptions - siberian traps - and possibly melting of methane hydroxides. Whether it was triggered by an asteriod impact is not known. This was BEFORE the dinosaur era!

How to reduce ocean acidification Basically reduce carbon dioxide emissions Switch to renewable energy Divest from fossil fuel stocks Use less energy for driving and at home Support a carbon tax Contact 350.org 3 min guardian video Keep it in the Ground Note - geoengineering with sulfate aerosols will NOT help the oceans

Resources http://www.pmel.noaa.gov/co2/story/What+is+Ocean+Acidification%3F http://www.pmel.noaa.gov/co2/story/Acidifying+Water+Takes+Toll+On+Northwest+Shellfish http://en.wikipedia.org/wiki/Permian%E2%80%93Triassic_extinction_event http://en.wikipedia.org/wiki/Ocean_acidification http://www.acespace.org/