Despite the concern about carbon-intensive imports from China, they account for less than 10 percent of all but cement imports. Canada is the largest foreign source of all carbon-intensive imports except chemicals, where it ranks second only to Trinidad and Tobago. Canada accounts for more than half of U.S. paper and aluminum imports, compared with China at 3 percent. That said, it is important to note that over the past 15 years, more U.S. carbon-intensive imports have come from developing countries. How this trend translates into competitiveness of U.S. industry under trade measures that attach a price to embedded carbon in imports depends on the carbon intensity of foreign production. The developing countries from which these goods are imported are, in many industries, less carbon-intensive on average than the United States.