ijust wonder if both you and cass sunstein have concluded that climate change is too urgent, too big,problem for us as a species for the sort of tactics of nudge and gentle persuasion to be effective. no, on the contrary. so here's what we say, is that... i said something like this earlier, nudge is part of the solution to any problem. we like, you know, i'm still in economist although some people say i've lost my credentials. like every economist in the world, i think we need to start with getting the prices right. so i think we need a global carbon tax or carbon trade system. as long as emissions are free, there will be too much of them. there is no economist on earth that disagrees with that. and sweden has shown us that it's possible to do this and still have a healthy economy. that's not to say that nudges can't help. automatically enrolling people into a green energy source increases enrollments by 50 percentage points. telling people how much energy they're using compared to their neighbours reduces energy useage by two or three percent. that may seem like a small number but, a