Christian Science Monitor: As the United States considers its own cap-and-trade system to reduce domestic emission levels, support is growing behind the idea of a “carbon tariff,” a tax on imports from countries which are not undertaking similar environmental measures. Recently, Energy Secretary Steven Chu endorsed the idea of a carbon tariff as a means of defending the international competitiveness of American industries. His concern is that other states will have an “unfair” trade advantage over the United …