There are no specific requirements in that regard, although we do have provisions under the environmental co-operation agreement that we would co-operate on various issues related to climate change, even though we did get a significant amount of resistance from the U.S. on issues related to climate change.
When it comes to many of the elements, including some of those that you're referring to, we do have this environmental co-operation agreement that obliges us to discuss these kinds of issues and try to find ways forward that we can both live with.
However, the issue of specific carbon taxes applying in a cross-border kind of fashion was not addressed.