merritt turetsky is thee. director of the institute of the university of colorado,at boulder, and she joins me from a cabin in canada. dr. turetsky, thank you very much for being here. >> thank you. >> brangham: can you please help us understand what is on in the arctic right now? what is driving this intense heat wave?et >>e start with an analogy. so when we come down with an fever, wr bodies spike a temperature, we stop, we realize th there's a problem and w provide care. and that's exactly what's happening today. the arctic is feveri with temperatures spiking above 100 degrees fahrenheit in multiple locations. reso these extreme tempera are very unusual. they are record breaking. but this is part of a longer term trend. in fact, last year, last summer was a very warm period in the arctic and siberia and parts of russia experienced the warmest winter on record. and it's part of trend that we anticipate will become more frequent in the arctic because c mate change. >> brangham: so i understand there's also th