Contrary to the views expressed in this article, carbon tarifffs are very workable. The EU and US simply need to apply a domestic carbon levy equivalent to that of their carbon tariff.

http://www.reuters.com/article/GCA-GreenBusiness/idUSTRE59S1DE20091029

And rather than erring by looking to determine emissions on a "per person basis" the correct method is on a "per square kilometer" basis. Afterall, governments are responsible for what goes on within the borders of their countries.

Syd Martin

Another voice which sees how a carbon tax on imports can be WTO compliant.

http://www.latimes.com/news/nation-and-world/la-fg-carbon-qa21-2009nov21,0,954377.story

Syd Martin