Calculating Carbon Emissions of Goods

As reported by the Wall Street Journal last week, "Europe is preparing legislation that would jolt the rules of international trade by taxing imported goods based on the greenhouse gases emitted to make them...The EU proposal would require European importers to buy certificates that would cover the carbon content of their imports in certain sectors...The proposal would establish a new agency to enforce the rules and certify private companies that importers would need to hire to calculate the carbon content of goods produced overseas...The rules could come into effect during a transitional period starting as early as . . .