Climate change and rising seas Environmental Science 21 October 2009 Donald Winslow Readings: Withgott & Brennan 2009 Essential Environment, 3rd ed., Ch.

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Presentation transcript:

Climate change and rising seas Environmental Science 21 October 2009 Donald Winslow Readings: Withgott & Brennan 2009 Essential Environment, 3rd ed., Ch 14 pp Lester Brown, Plan B 3.0, Chapter 3

Climate change Milankovitch cycles CO 2 and temperature Anthropogenic climate change CO 2 emissions CH 4 emissions Intergovernmental Panel on Climate Change Remedies

Milankovitch cycles Shape of Earth's orbit Tilt of axis Wobble

CO 2 and temperature

Anthropogenic climate change Evidence & effects Temperature, CO 2, melting ice, rising seas Hurricanes Species distributions Pronounced warming at higher latititudes Increases in photosynthesis from increased CO 2 Decreases in photosynthesis from increased T

Civilization & the New World Readings from Lester Brown Plan B 3.0; Chapter 3

Features of Plan B Electronic version available as pdf files References Data sets as xls files “Cutting carbon emissions 80% by 2020”

Rising temperatures & rising seas Effects of rising temperature Crop yield Reservoirs in the sky Melting ice & rising seas Destructive storms Cutting carbon emissions 80% by 2020

Sea level rise IPCC estimate cm by 2100 Intergovernmental Panel on Climate Change Estimate based on data thru 2006 Considering 2007 melting, maybe 200 cm After Greenland & West Antarctic Ice Sheet melt: cm

Arctic ice on 16 September 2008 Photo by NASA/Goddard Space Flight Center, via Reuters

EPA study of sea level rise

Gulf of Mexico after 12 m rise in sea level in the UK

Montane glacial melt Implications for agriculture Himalayas & Tibetan Plateau Feed all major rivers of China & India Necessary for rice production

Remedies Emission reduction Carbon sequestration Increasing albedo Adapting to change

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