mode of taking action together. there were a number of these climate meetings happen every year. there were a number of meetings along the way. the mandate for this negotiation started in it was put together in 2011. and so we ve been in a four-year negotiation going bit by bit, year by year, to get to the place we are now. and as you said, this is an historic and enormously important agreement. so there s been a range of reactions, and there s been a split among folks who sort of follow this, particularly sort of climate activists. a lot of them are praising it and saying it s great. a lot of them saying it does too little. a lot of them worried about essentially enforceability. my understanding is that countries come up with their own pledges, those pledges are public and they can be held to by sort of peer pressure and shaming. but where is the accountability mechanism to make sure people hit their targets? well, look, there is two things about that. first of all, it is very