but there could be simple changes made, and these changes relate to materials. one of the projects where we are demonstrating change is the cool roads trail. let's take the heat—stress trekkers and put them out in this cool street, and we'll collect some measurements on this stinking hot day. this yellow concrete is only at about 60 degrees, so nearly 10 degrees cooler than the asphaltjust out on the road, which is 70—72 degrees. it's quite interesting. they removed all the bitumen and you can see the different surface materials bringing in the verges, planting more trees, so i think it's a great idea. beyond 42 degrees, mortality increases substantially. this is what climate change looks like, ladies and gentlemen. in november 2018, up to one—third