Thus forests may be an important sink for

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increased, both from litter and fine root turnover. Thus, forests may be an important sink for anthropogenic CO 2 .But this forest may represent the upper limit of potential CO 2 uptake. Older forests, or ones with less nutrients and water, may not have as great a capacity for CO 2 uptake. The Intergovernmental Panel on Climate Change (IPCC) was established in 1988. The panel includes experts in atmospheric and climate science from around the world.They use sophisticated modeling and analysis of data from the scientific literature to evaluate underlying causes of observed climate change, and scenarios for the future. Since the mid-19 th century, CO 2 concentrations have increased at a rate faster than at any other time in the past 400,000 years.Even if CO 2 emissions are reduced dramatically, CO 2 levels will remain high due to a time lag in ocean uptake (decades to centuries). C O 2 H 2 O H 2 C O 3 H H C O 3 2 H C O 3 2 Ocean acidity has increased 30% over the last century. Further increase is predicted by models. Many marine organisms form shells of carbonate. Increasing acidity will dissolve existing shells and lower carbonate concentrations will decrease the ability to synthesize new shells. On Australia’s Great Barrier Reef, calcium carbonate formation declined by 14% from 1990 to 2009. Anthropogenic CO 2 emissions therefore have potential to tremendously alter the diversity and function of marine ecosystems. Paul Crutzen has suggested that we have entered a new geological period, which he has called the Anthropocene epoch, to indicate the extensive impact of humans on our environment. I) CO 2 other GG in atmosphere increasing II) Ocean waters warming III) Thermal expansion resulting modest increase sl IV) Ice sheet loss could accelerate slr ~2-5 xs current rate V) Ocean Acidification lowering aragonite saturation state VI) Higher annual precip, More event driven, Coastal salinization As sea level rises, coastlines retreat
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  • Spring '11
  • DALEGAWLIK

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