One-third of China's carbon emissions come from manufacturing electronics and other goods that are then exported worldwide, according to a July report in the journal Energy Policy.
The findings come from researchers led by Christopher Weber, a professor of civil and environmental engineering at Carnegie Mellon University.
Researchers measured 1.7 billion metric tons of carbon dioxide resulting from China's exporting industries in 2005. That rose from 760 million tons in 2002 and from 230 million tons in 1987, based on an analysis of economic and emissions reports from China.
In that time, carbon emissions from making electronics for export rose from 13 percent to 22 percent, according to a New Scientist report about the study.
In June, the Netherlands Environmental Assessment Agency found that China beat the United States in 2007 for the first time as the world's largest emitter of carbon dioxide. Reports often blame China's booming economic growth and reliance on coal-fired power plants for its increased emissions.
However, the Chinese government has argued that nations importing its products are also responsible for global warming that may result from manufacturing the goods.