moving forward. >> this is the very same agreement the u.s. president promised to pull out of, that can't happen until 2020. given the fact there were u.s. representatives who signed on to these rules, are some seeing this as an opening that attitudes are shifting about this agreement? >> reporter: in the long term, yes, they've given their lives to the science of climate change. it's a fact it's happening. i think many say their presence here or inside those negotiating rooms was not acting as a spoiler. they were trying to throw a wrench in the works, so to speak, and i think that may be because they would have said, listen, we're leaving at the end of 2020. donald trump gets his way so the rules don't really affect us but that would have been difficult for them to get that done on a higher level the u.s. has been a