dr dann mitchell.ver millennia, they are often built around a resource or around defending off the french or something like that, so not designed to be efficient at cooling. so some of the american cities, for instance, are built in grids and the aircanflow instance, are built in grids and the air can flow much more freely in those cities. so that trapping of the temperature means the temperatures rise faster in a city than the surrounding areas. it is also to do with the sort of materials used in those cities, but some cities in, say, southern europe they will paint their buildings white, which will make them more effective and that will combat some of this effect. find effective and that will combat some of this effect-— of this effect. and let's ask dr isabel bishop _ of this effect. and let's ask dr isabel bishop the _ of this effect. and let's ask dr isabel bishop the same i of this effect. and let's ask dr i isabel bishop the same question, i don't know if you have an answer to that? , ., , don't