Our bridges, motor­ways, tun­nels, and dams, and all the build­ings that make up our infra­struc­ture are vital to our soci­ety and eco­nom­ic growth yet we take them for grant­ed. The shock­ing truth is that our infra­struc­ture is crum­bling beneath our feet. And this is cost­ing us dear­ly, both in terms of mon­ey and car­bon.