Each person in the United States has a carbon footprint of 18 tons (16.4 metric tons) per year, more than twice that of a person in China and eight times that of someone in India. However, the United States still has the highest per capita consumption. Data shows China's per capita emissions now outstrip Europe's for the first time. The biggest carbon dioxide offenders are China, India, the United States and the European Union.
Because the gas lingers in the atmosphere for decades, even immediate and drastic cuts won't lower its levels for decades. In the atmosphere, carbon dioxide absorbs heat and raises temperatures on Earth. About 75 percent of carbon dioxide emissions come from burning fossil fuels such as oil and gas, and from making cement, the study reports.
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