impacts3 - Some Environmental Problems A rather disturbing...

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Some Environmental Problems A rather disturbing sample
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The Smoking Gun
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Primary Industry Exports
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What can you do to inform yourself? Consider multiple points of view Consider who has a prior agenda Consider who profits from the status quo Consider a variety of data Consider the history of debate over a range of issues including toxic chemicals, tobacco, etc.
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Global climate change The greenhouse effect is not a subject of scientific dispute; our level of present and future contribution to the greenhouse effect is Most scientists agree on an increase over the next century of 2.5 – 10.5 degrees Fahrenheit Scientists have recently discovered surplus energy stored in the oceans (as a heat sink) that would double the existing global warming even if solar radiation gains and losses were balanced tomorrow Evidence of climate change: migration of tree-line melting ice temperature differentials in the earth’s crust changes in species range
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Greenhouse Effect Undisputed physical property of certain gases
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Data from Climatologist Tom Crowley What accounts for global warming? Volcanism, variations in solar radiation (blue and green lines) & oceanic damping account for about ¼ of the change since 1850 Greenhouse gas increases & sulfate aerosols (lavender line) explain the rest Orange line is the predicted temperature using the model, grey is measured 20 th c. warming is the most significant warming trend in 1000 years Projected changes in 21 st c. will make the earth the hottest it’s been in 400,000 yrs! Gabriele C. Hegerl, Thomas J. Crowley, Steven K. Baum, Kwang-Yul Kim and William T. Hyde. 2003. “Detection of volcanic, solar and greenhouse gas signals in paleo-reconstructions of Northern Hemispheric temperature” Geophysical Research Letters 30 (5): 1242, doi: 10.1029/2002GL016635.
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NASA data
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Data from GlobalWarming.org
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Who should you believe? GlobalWarming.org is supported by the Cooler Heads Coalition, which is in turn supported by the National Consumer Coalition NCC: strong ties to conservative organizations working to privatize schools, cut taxes, end government regulation of corporations, and reduce environmental regulations http://www.consumeralert.org/ncc/members.htm NASA and Climatology professors at major research universities are interested in understanding the issue but will make money no matter what they find as long as they are conducting research These sources have no vested interest in particular findings http://www.giss.nasa.gov/research/observe/surftemp/
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earth is not warming Satellites were the main source of data used by the group arguing that global warming is not occurring In 2003 the temperature-sensing satellites were found ( by NCAR, the Lawrence Livermore National Laboratory, and Remote Sensing Systems in Santa Rosa, CA ) to have drifted in their orbits and to produce errors because of variations in their
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impacts3 - Some Environmental Problems A rather disturbing...

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