It's a good question, and thank you for asking it.
The international shipping is a very large and growing source of greenhouse gas emissions, and in the climate change negotiations no one has really known how to deal with it, because it doesn't belong to any one country, and it's not one country that can impose reductions on it. We see the need to give the industry incentive to reduce its emissions.
What Oxfam and the World Wildlife Fund together have proposed is a levy on fuel, on shipping fuel. We've asked an independent economic analyst to do a study of implications for world trade of this. It would indeed have an impact of about 0.2% on world trade, which is relatively minor. We propose a compensation mechanism for the poorest countries to be given part of the revenue as compensation so they can make up for that 0.2%.