managing director of research at clearview energy says -- it is messy, it is the last desirable way tout a price on carbon, but we could see a transition from a trade war to a carbon trade war. william is next up in northampton, massachusetts, he is on our students and parents line. welcome. caller: good morning. about wanted to comment climate change. i really admire this generation of youngsters out here, like greta thornburg, and all the people who are standing up for a cause. it is very inspiring to others. that,t -- besides personally, what i think about climate change is, in the purview of estrogen physics and andogic time with the space the weather, and how the planet actually involved from molten rock to having this atmosphere, it took billions of years. now, we have only been here for tens of thousands of years, but for these scientists to come right now and say that we have -- weta, we have this have a very, very slim margin of usable data that is somewhat reliable. and if you want to say that there are more fierce storms and the ice caps are melting, you can say that, but re