Remember when Republicans' biggest argument against the U.S. pursuing any type of action on climate change was that, without us being able to trust other countries to do the same, anything we achieved would basically be meaningless? That's been a bit of a harder sell since President Obama reached a historic deal with China: both countries, which are collectively responsible for 40 percent of the world's greenhouse gas emissions, pledged to take significant steps to reduce them.GOP naysayers, of course, were quick to argue that China couldn't be trusted to follow through on its end of the deal.