This has been a critical issue in discussions about implementing a global greenhouse gas system. Obviously, parts of the developing world have been more forward in taking on the challenge of reducing greenhouse gas. For industries like fertilizer—and there are many other industries that face this issue as well—everyone has to compete in the same global marketplace. If certain parts of the world have more costly environmental measures and others don't, that creates a competitive imbalance. Certainly I think if you look at what is being discussed in the United States under their cap and trade system—for example, the Waxman bill—you will note that this is recognized by the United States. Part of the bill includes trade measures that would impact on countries that aren't reducing greenhouse gases.
On May 7th, 2009. See this statement in context.