Featured Research

from universities, journals, and other organizations

Carbon Dioxide Emission Reduction Assumptions Overly Optimistic, Study Says

Date:
April 4, 2008
Source:
National Center for Atmospheric Research/University Corporation for Atmospheric Research
Summary:
Reducing global emissions of carbon dioxide over the coming century will be more challenging than society has been led to believe, according recent research.

Renewable energy sources, such as wind, could help society reduce emissions of carbon dioxide.
Credit: Photo by Bob Henson Copyright UCAR

Reducing global emissions of carbon dioxide (CO2) over the coming century will be more challenging than society has been led to believe, according to a new research commentary appearing April 3 in Nature.

Related Articles


The authors, from the University of Colorado at Boulder, the National Center for Atmospheric Research (NCAR) in Boulder, and McGill University in Montreal, say the Intergovernmental Panel on Climate Change (IPCC) has significantly underestimated the technological challenges of reducing CO2 emissions. The study, "Dangerous Assumptions," concludes that the IPCC is overly optimistic in assuming that, even without action by policymakers, society will develop and implement new technologies to dramatically reduce the growth of future emissions.

"In the end, there is no question whether technological innovation is necessary--it is," write the authors in the Nature commentary. "The question is, to what degree should policy focus explicitly on motivating such innovation" The IPCC plays a risky game in assuming that spontaneous advances in technological innovation will carry most of the burden of achieving future emissions reductions, rather than focusing on those conditions that are necessary and sufficient for those innovations to occur."

Recent changes in "carbon intensity"--CO2 emissions per unit of energy consumed--already are higher than those predicted by the IPCC because of rapid economic development, says lead author Roger Pielke Jr. of the University of Colorado. In Asia, for instance, the demands of more energy-intensive economies are being met with conventional fossil-fuel technologies, a process expected to continue there for decades and eventually move into Africa.

In estimating the emissions reductions required for CO2 concentration stabilization, the IPCC divides future emissions changes into those that will occur spontaneously (such as in the absence of climate policies) and those that are policy driven. This division hides the full challenge associated with stabilizing the amount of carbon dioxide in the atmosphere. The Nature commentary points out, for example, that to stabilize CO2 levels at around 500 parts per million (compared to the present level of about 390 ppm), the IPCC scenarios assume that 57 to 96 percent of the total carbon removed from the energy supply over the coming century would occur spontaneously.

"According to the IPCC report, the majority of the emission reductions required to stabilize CO2 concentrations are assumed to occur automatically," says Pielke. "Not only is this reduction unlikely to happen under current policies, but we are moving in the opposite direction right now. We believe these kinds of assumptions in the analysis blind us to reality and could potentially distort our ability to develop effective policies."

Stabilization of atmospheric concentrations of CO2 and other greenhouse gases was the primary objective of the 1992 United Nations Framework Convention on Climate Change approved by almost all countries, including the United States, notes co-author Tom Wigley of NCAR.

"Stabilization is a more daunting challenge than many realize and requires a radical 'decarbonization' of energy systems," Wigley says. "Global energy demand is projected to grow rapidly, and these huge new demands must be met by largely carbon-neutral energy sources--sources that either do not use fossil fuels or that capture and store any emitted CO2."

Unlike the IPCC assumptions of large future "spontaneous" technological innovations, the Nature commentary authors began with a set of "frozen technology" scenarios as baselines--scenarios in which energy technologies are assumed to stay at present levels.

"With a frozen technology approach, the full scope of the carbon-neutral technology challenge is placed into clear view," says co-author Christopher Green of McGill University.

"In the end, our message should be viewed optimistically rather than pessimistically," Pielke notes, "because it is only with a clear-eyed view of the mitigation challenge that we can ever hope to adopt effective policies. We hope that our analysis is one step toward such a clear-eyed view."

The University Corporation for Atmospheric Research operates the National Center for Atmospheric Research under primary sponsorship by the National Science Foundation.


Story Source:

The above story is based on materials provided by National Center for Atmospheric Research/University Corporation for Atmospheric Research. Note: Materials may be edited for content and length.


Cite This Page:

National Center for Atmospheric Research/University Corporation for Atmospheric Research. "Carbon Dioxide Emission Reduction Assumptions Overly Optimistic, Study Says." ScienceDaily. ScienceDaily, 4 April 2008. <www.sciencedaily.com/releases/2008/04/080402131140.htm>.
National Center for Atmospheric Research/University Corporation for Atmospheric Research. (2008, April 4). Carbon Dioxide Emission Reduction Assumptions Overly Optimistic, Study Says. ScienceDaily. Retrieved November 27, 2014 from www.sciencedaily.com/releases/2008/04/080402131140.htm
National Center for Atmospheric Research/University Corporation for Atmospheric Research. "Carbon Dioxide Emission Reduction Assumptions Overly Optimistic, Study Says." ScienceDaily. www.sciencedaily.com/releases/2008/04/080402131140.htm (accessed November 27, 2014).

Share This


More From ScienceDaily



More Earth & Climate News

Thursday, November 27, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Scientists Find Invisible Space Shield Protecting Earth

Scientists Find Invisible Space Shield Protecting Earth

Newsy (Nov. 27, 2014) — An invisible barrier is keeping dangerous super fast electrons from interfering with our atmosphere, but scientists aren't entirely sure how. Video provided by Newsy
Powered by NewsLook.com
Bolivian Recycling Initiative Turns Plastic Waste Into School Furniture

Bolivian Recycling Initiative Turns Plastic Waste Into School Furniture

Reuters - Innovations Video Online (Nov. 26, 2014) — Innovative recycling project in La Paz separates city waste and converts plastic garbage into school furniture made from 'plastiwood'. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
Blu-Ray Discs Getting Second Run As Solar Panels

Blu-Ray Discs Getting Second Run As Solar Panels

Newsy (Nov. 26, 2014) — Researchers at Northwestern University are repurposing Blu-ray movies for better solar panel technology thanks to the discs' internal structures. Video provided by Newsy
Powered by NewsLook.com
Antarctic Sea Ice Mystery Thickens... Literally

Antarctic Sea Ice Mystery Thickens... Literally

Newsy (Nov. 25, 2014) — Antarctic sea ice isn't only expanding, it's thicker than previously thought, and scientists aren't sure exactly why. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins