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US is Still World's Biggest CO2 Emitter
According to a report in New Scientist, the Carnegie Institution for Science in Stanford, California, reports that in 2004, 23 per cent of global CO2 emissions - some 6.2 gigatonnes - went in making products that were traded internationally.
Most of these products were exported from China and other relatively poor countries to consumers in richer countries.
Some countries, such as Switzerland, "outsourced" over half of their carbon dioxide emissions in this way because they have a high import-to-export ratio of such energy-intensive goods as consumer electronics, motor vehicles and machinery.
The average European is responsible for adding more than 4 tonnes of CO2 to the atmosphere in the manufacture of goods imported from other countries.
For people in the US, the figure was nearly half that - 2.5 tonnes - thanks to US exports of emissions-intensive goods that offset much of the C02 it imports.
"If we want to understand our footprint of emissions, we have to understand that others are emitting on our behalf to make our goods and services," said study co-author Ken Caldeira.
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