increase in carbon in the atmosphere and the carbon change it's producing making more extreme weather more common. the to answer to that is yes. uses a good anology to describe the relationship between climate change and the increase in extreme weather. >> imagine a baseball player who has been taking steroids. this baseball player steps to the plate and hits a home run and, yes, the question, was that home run due to the steroids? if you look at the number of home runs he hits over a season when he's taking steroids and compare that to a previous season he wasn't taking steroids only then you can figure him he is only able to hit a home run and the chances of him hitting a home run are greater. >> oft aen funded by the fossil fuel industry that has to sew doubt among americans that our carbon emissions are warming the planet.