but it's quite difficult to do. but this we can say. it's how much bigger is a given hurricane now than it would have been before human caused climate change. so there is all this trouble now with not only the size of hurricanes, but how the winds aloft affect how fast they move. and as has been pointed out by many people over the last few days, it's not the category number that matters. it's just how much rain does it dump for how long. >> right. >> along with the wind. in the good old days, there was not very much infrastructure in the bahamas or other caribbean islands because fewer people lived there a century ago. but now electrification and the ways of the developed world are making their way into these areas. so when everything is torn up, it's a mess. so the people who live there, of course, it's very troublesome. but that's just one example of other places around the world