該項由瓊斯和REAL總監丹尼爾‧卡門（Daniel Kammen），也是加州大學柏克萊分校教授能源和資源的教授，目前利用休假期間在世界銀行從事研究所共同作出的研究報告，刊登在本期的 「環境科學與技術」 雜誌。
With Earth Day around the corner many are taking a fresh look at how their actions affect the environment. A new study by researchers at the University of California, Berkeley, finds that who you are and where you live make a big difference in which activities have the largest impact on the climate.
"Everyone has a unique carbon footprint," says Christopher Jones, lead author and a researcher in UC Berkeley's Renewable and Appropriate Energy Laboratory, or RAEL. "There is no one-size-fits-all set of actions that people should take."
The study considers the carbon footprint of all household economic activity, including transportation, energy, food, goods, services, water and waste.
Carbon footprints are a measure of the climate-warming greenhouse gases released during the production, use and disposal of products and services.
The production phase includes all processes between the time raw materials are extracted until they reach consumers as finished products in stores.
The study analyzed typical household carbon footprints in all 50 U.S. states, 28 regions, six households sizes and 12 income brackets for a total of several thousand possible combinations of household types.
The results of this analysis have been summarized in an online carbon calculator, located at http://coolclimate.berkeley.edu, that can be used by anyone to estimate his or her carbon footprint and identify areas where lifestyle changes would create the largest reductions in greenhouse gas emissions.
The study by Jones and RAEL director Daniel Kammen, a UC Berkeley professor of energy and resources who currently is on leave at the World Bank, appears in the current issue of the journal "Environmental Science & Technology."
"Our primary message is simple. If you are concerned about reducing your carbon footprint, or the carbon footprint of others through policy, it is important to focus on the actions that lead to the greatest reductions," said Kammen. "Our online tool can help people do just that."
Users can get a quick estimate of their carbon footprint profile by typing in their location, household size and income, then spend a few minutes answering basic questions about lifestyle for more personalized estimates. They can then compare their results to similar households and get a customized action plan.
Users also can create accounts and join groups of similar households to share their carbon footprint profiles and reduction strategies. An online competition allows cities, counties, community groups and businesses to compete against each other.