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Energy technologies not enough to sufficiently reduce carbon emissions, NYU's Hoffert concludes
Date:9/9/2010

Current energy technologies are not enough to reduce carbon emissions to a level needed to lower the risks associated with climate change, New York University physicist Martin Hoffert concludes in an essay in the latest issue of the journal Science.

Many scientists have determined that in order to avoid the risks brought about by climate change, steps must be taken to prevent the mean global temperature from rising by more than 2C above pre-industrial levels. Current climate models indicate that achieving this goal will require limiting atmospheric carbon dioxide (CO2) concentrations to less than 450 parts per million (ppm), a level that implies substantial reductions in emissions from burning fossil fuels.

The present atmospheric level of CO2 is approximately 385 ppm, some 100 ppm above the pre-industrial level of about 280 ppm. It is expected to rise in future years.

"So far, efforts to curb emissions through regulation and international agreement haven't worked," Hoffert writes. "Emissions are rising faster than ever, and programs to scale up 'carbon neutral' energy sources are moving slowly at best."

Hoffert points to a pair of factors that show why current energy technologies are not sufficient to reduce carbon emissions to a level advocated by scientists.

One, alternative energy sources, such as solar and wind electricity, are not adequate to achieve "massive market penetration," which requires utility-scale systems that can store intermittent supplies of power until they are needed.

While Denmark and Norway have developed methods for this type of storage, these aren't "widely feasible in the United States, and other approaches to store power are expensive and need substantial research and testing," Hoffert contends.

Two, reliance on carbon-emitting fuels is once again growing.

"As natural gas and oil approach peak production, coal production rises, and
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Contact: James Devitt
james.devitt@nyu.edu
212-998-6808
New York University
Source:Eurekalert

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