a good attribute when it comes to dealing with climate change, although a lot of people say it is now time to act and move and the time for patients is over. the london mayor sadiq khan s new ultra low emissions zone expansion has seen the scheme stretch from central london to all roads in the north and south circular. tell us about what c40 is? one of the thins tell us about what c40 is? one of the things we tell us about what c40 is? one of the things we know tell us about what c40 is? one of the things we know from - tell us about what c40 is? one of the things we know from the - tell us about what c40 is? one of. the things we know from the united nations is more than half of the world s population currently lives in cities and that is going in one direction, it will be two thirds over the course of the next 20 years, so it cities do not want to be a problem when it comes to the climate emergency. they want to be the solution. c40 represents almost a hundred cities across the g