Free trade is one of the greatest forces for positive change the world has ever seen. It opens new economic frontiers for American good and services, allows America access to the best the world has to offer, and promotes peace between nations. But free trade is coming under increasing assault as some in Washington, including the Obama administration, promote restricting free trade in the name of limiting carbon dioxide emissions. Secretary of Energy Steven Chu recently advocated using tariff duties as a “weapon” to restrict free trade, and some policymakers have also advocated increasing tariffs to “protect” some politically connected U.S. businesses.