The United States runs a trade deficit in all five carbon-intensive industries included in the Peterson Institute for International Economics/WRI report "Leveling the Carbon Playing Field", despite running a trade surplus in certain product lines. Aluminum is, by far, the most exposed to trade, with net imports accounting for 60 percent of U.S. consumption. But even in cement, long considered the classic “nontradable,” foreign producers meet nearly 25 percent of domestic demand. Domestic producers have the largest market share in paper and energy-intensive chemicals, with net imports accounting for 10 and 6 percent, respectively.