The Carnegie Institution of Science released a new study this week finding that one-third of the carbon dioxide emissions developed countries release into the atmosphere result from goods and services produced outside their borders. The report’s details are troubling: Carnegie’s researchers estimate that 2.5 tons of CO2 per person are consumed in the United States but are produced elsewhere, and that figure spikes to 4 tons per European. Another point that will cause considerable disagreement among global climate negotiators is Carnegie’s analysis that one-quarter of the emissions in China are actually the result of its exports to its trading partners such as the United States.