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Stephen H. Schneider : ウィキペディア英語版
Stephen Schneider

Stephen Henry Schneider (February 11, 1945 – July 19, 2010) was Professor of Environmental Biology and Global Change at Stanford University, a Co-Director at the Center for Environment Science and Policy of the Freeman Spogli Institute for International Studies and a Senior Fellow in the Stanford Woods Institute for the Environment. Schneider served as a consultant to federal agencies and White House staff in the Richard Nixon, Jimmy Carter, Ronald Reagan, George H. W. Bush, Bill Clinton, George W. Bush and Barack Obama administrations.
His research included modeling of the atmosphere, climate change, and the effect of global climate change on biological systems. Schneider was the founder and editor of the journal ''Climatic Change'' and authored or co-authored over 450 scientific papers and other publications. He was a Coordinating Lead Author in Working Group II IPCC TAR and was engaged as a co-anchor of the Key Vulnerabilities Cross-Cutting Theme for the Fourth Assessment Report (AR4) at the time of his death. During the 1980s, Schneider emerged as a leading public advocate of sharp reductions of greenhouse gas emissions to combat global warming. In 2006 Professor Schneider was an Adelaide Thinker in Residence advising the South Australian Government of Premier Mike Rann on climate change and renewable energy policies.〔http://www.thinkers.sa.gov.au〕 In ten years South Australia went from zero to 31% of its electricity generation coming from renewables.
An annual award for outstanding climate science communication was created in Schneider's honor after his death.〔http://www.c-spanvideo.org/program/309764-2〕
== Early work ==
Schneider grew up in Long Island, New York. He studied engineering at Columbia University, receiving his bachelor's degree in mechanical engineering in 1966. In 1971, he earned a Ph.D. in mechanical engineering and plasma physics. Schneider studied the role of greenhouse gases and suspended particulate material on climate as a postdoctoral fellow at NASA's Goddard Institute for Space Studies.
In 1971, Schneider was second author on a ''Science'' paper with S. I. Rasool titled "Atmospheric Carbon Dioxide and Aerosols: Effects of Large Increases on Global Climate" (''Science'' 173, 138–141). This paper used a one-dimensional radiative transfer model to examine the competing effects of cooling from aerosols and warming from CO2. The paper concluded:
However, it is projected that man's potential to pollute will increase 6 to 8-fold in the next 50 years. If this increased rate of injection... should raise the present background opacity by a factor of 4, our calculations suggest a decrease in global temperature by as much as 3.5 ''°C''. Such a large decrease in the average temperature of Earth, sustained over a period of few years, is believed to be sufficient to trigger an ice age. However, by that time, nuclear power may have largely replaced fossil fuels as a means of energy production.

Carbon dioxide was predicted to have only a minor role. However, the model was very simple and the calculation of the CO2 effect was lower than other estimates by a factor of about three, as noted in a footnote to the paper.
The story made headlines in the ''New York Times''. Shortly afterwards, Schneider became aware that he had overestimated the cooling effect of aerosols, and underestimated the warming effect of CO2 by a factor of about three. He had mistakenly assumed that measurements of air particles he had taken near the source of pollution applied worldwide. He also found that much of the effect was due to natural aerosols which would not be affected by human activities, so the cooling effect of changes in industrial pollution would be much less than he had calculated. Having found that recalculation showed that global warming was the more likely outcome, he published a retraction of his earlier findings in 1974.〔Pearce, Fred, ''The Climate Files: The Battle for the Truth about Global Warming'', (2010) Guardian Books, ISBN 978-0-85265-229-9, pp. 24–27. "When he redid the maths, the balance between warming and cooling now tipped strongly towards warming."〕
In a 1976 book ''The Genesis Strategy'' he discusses both long-term warming due to carbon dioxide and short-term cooling due to aerosols,〔Stephen H. Schneider and Lynne E. Mesirow, ''The Genesis Strategy: Climate and Global Survival'', Plenum, April 1976. (Quotes ) (accessed 22 October 2014)〕 and advocated for adopting policies that are resilient to future changes in climate.〔The reference is to the story of Joseph, in '' Genesis'' 41-42, who advises the Pharaoh to store harvest from years of abundant harvest to prepare for years of famine.〕

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