The European Union is ushering in a new era of international trade that could help rein in climate change. Lawmakers for the group of 27 countries adopted rules for taxing imports based on the amount of carbon dioxide that companies emit making those goods. Experts say it's the first time a major economy has married climate and trade policy, and that it could lead other countries to do the same.
By putting a price on emissions from some of the stuff it imports — like steel and aluminum — the EU is giving companies around the world an incentive to clean up their operations.
