

This sort of change is done on a city level and quite a few American cities have improved over the last couple years. But you need to keep in mind that Paris is starting on a very different level. Most of these streets would be on the better site of things by US standards before the conversion.













Thermal mass so stuff like stone, brick, earth or similar stores the average temperature. The more you have the longer the time period they average out over. So for in Panelleria the mean temperature in August is 26C and that is what those buildings keep over the entire day, even though it can get as hot as 34C during the day. If you have more thermal mass, for example in caves or underground structures, you can have the mean temperature of an entire year.