He seems to like them:
I will also require strong environmental standards so multinational companies cannot profit by exploiting weak environmental laws and enforcement in some countries. For example, after the U.S. has capped its greenhouse gas pollution as I have proposed, trade policy could be used if necessary to encourage similar commitments by other nations.
This statement is a little vague, but as I read it he is saying, once the U.S. has dealt with its own carbon issues, it could start sanctioning others who have not. Here's my question: If the U.S. does not deal with these issues, would he support the EU or others imposing sanctions on the U.S.?
(Hat tip to Opinio Juris for pointing out the ASIL survey that included this statement)
