Press Release: New Report Examines Climate Impacts and Mitigation Costs of Non-CO2 Gases

For Immediate Release: 
February 11, 2003

Contact:  Press, 703-516-4146

New Report Examines Climate Impacts and Mitigation Costs of Non-CO2 Gases

Washington, DC - To effectively limit climate change, and to do so in a cost-effective manner, climate policies must address emissions of both carbon dioxide (CO2) and the other greenhouse gases, according to a new report from the Pew Center on Global Climate Change. Although CO2 is the principal greenhouse gas contributing to global warming, other gases-including methane, nitrous oxide, and a number of manmade, industrial-process gases (such as hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride)-are also important contributors to climate change.

"The non-CO2 gases contribute a great deal to climate change, yet there is currently little or no incentive to control these emissions," explained Eileen Claussen, President of the Pew Center on Global Climate Change. "Curbing emissions of these greenhouse gases is both environmentally important and cost-effective."

Multi-Gas Contributors to Global Climate Change: Climate Impacts and Mitigation Costs of Non-CO2 Gases discusses the sources and amounts of these emissions, the atmospheric interactions of the various gases, and the relative costs of reducing them. Report authors John Reilly, Henry Jacoby, and Ronald Prinn of Massachusetts Institute of Technology use a general equilibrium modeling framework to analyze the costs and climate impacts of controlling various greenhouse gas emissions. The report discusses opportunities and difficulties associated with incorporating non-CO2 greenhouse gases into a climate policy framework.

The authors demonstrate that including all greenhouse gases in a moderate emissions reduction strategy not only increases the overall amount of emissions reductions, but also reduces the overall cost of mitigation: a win-win strategy. If, for example, total greenhouse gas emissions in the United States were held at year 2000 levels through 2010, many cost-effective reduction opportunities would come from the non-CO2 greenhouse gases.

In developing countries like India and Brazil, non-CO2 gases currently account for more than half of total greenhouse gas emissions. Thus, any cost-effective effort to engage developing countries in climate change mitigation should also include these other gases.

"The reduction of non-CO2 greenhouse gas emissions is a critical component of a cost-effective climate policy, so any efforts to reduce emissions of carbon dioxide should proceed hand-in-hand with reductions of the other gases," said Claussen.

Click here for a complete copy of this report and previous Pew Center reports.