Hi Jennifer
For your interest, today the IPA released a short research paper on carbon tariffs at the WTO Ministerial in Geneva. The short and sharp of the report is that carbon tariffs are a costly, ineffective policy instrument to offset domestically imposed carbon price signals, are likely in violation of WTO obligations and would likely sit around 10 per cent for US carbon-intensive products.
http://sustainabledev.org/wp-content/uploads/2009/12/Carbontariffs.pdf
Tim Wilson
Director, Climate and Trade Unit
Institute of Public Affairs