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Global warming: New research emphasizes the role of economic growth

2012-05-02
(Press-News.org) ANN ARBOR, Mich.—It's a message no one wants to hear: To slow down global warming, we'll either have to put the brakes on economic growth or transform the way the world's economies work.

That's the implication of an innovative University of Michigan study examining the evolution of atmospheric CO2, the most likely cause of global climate change.

The study, conducted by José Tapia Granados and Edward Ionides of U-M and Óscar Carpintero of the University of Valladolid in Spain, was published online in the peer-reviewed journal Environmental Science and Policy. It is the first analysis to use measurable levels of atmospheric carbon dioxide to assess fluctuations in the gas, rather than estimates of CO2 emissions, which are less accurate.

"If 'business as usual' conditions continue, economic contractions the size of the Great Recession or even bigger will be needed to reduce atmospheric levels of CO₂," said Tapia Granados, who is a researcher at the U-M Institute for Social Research (ISR).

For the study, the researchers assessed the impact of four factors on short-run, year-to-year changes in atmospheric concentrations of CO2, widely considered the most important greenhouse gas. Those factors included two natural phenomena believed to affect CO2 levels—volcanic eruptions and the El Niño Southern oscillation—and also world population and the world economy, as measured by worldwide gross domestic product.

Tapia Granados and colleagues found no observable relation between short-term growth of world population and CO₂ concentrations, and they show that incidents of volcanic activity coincided with global recessions, which brings into question the reductions in atmospheric CO2 previously ascribed to these volcanic eruptions.

In years of above-trend world GDP, from 1958 to 2010, the researchers found greater increases in CO2 concentrations. For each trillion in U.S. dollars that the world GDP deviates from trend, CO2 levels deviate from trend about half a part per million (ppm), they found. Concentrations of CO2 are estimated to have been between 200-300 ppm during preindustrical times. They are presently close to 400 ppm, and levels around 300 ppm are considered safe to keep a stable climate.

To break the economic habits contributing to a rise in atmospheric CO2 levels and global warming, Tapia Granados says that societies around the world would need to make enormous changes.

"Since the 1980s, scientists like James Hansen have been warning us about the effects global warming will have on the earth," Tapia Granados said. "One solution that has promise is a carbon tax levied on any activity producing CO2 in order to create incentives to reduce emissions. The money would be returned to individuals so the tax would not mean any extra fiscal burden."

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Established in 1949, the University of Michigan Institute for Social Research is the world's largest academic social science survey and research organization, and a world leader in developing and applying social science methodology, and in educating researchers and students from around the world. ISR conducts some of the most widely cited studies in the nation, including the Thomson Reuters/University of Michigan Surveys of Consumers, the American National Election Studies, the Monitoring the Future Study, the Panel Study of Income Dynamics, the Health and Retirement Study, the Columbia County Longitudinal Study and the National Survey of Black Americans. ISR researchers also collaborate with social scientists in more than 60 nations on the World Values Surveys and other projects, and the institute has established formal ties with universities in Poland, China and South Africa. ISR is also home to the Inter-University Consortium for Political and Social Research, the world's largest digital social science data archive. For more information, visit the ISR website at www.isr.umich.edu.

EDITORS: Figures depicting CO2 emission trends can be downloaded at www.ns.umich.edu/Releases/2012/May12/climate.html

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[Press-News.org] Global warming: New research emphasizes the role of economic growth