Fig. 3: Annual material composition of materials inflow in China’s megacities, 2001-2018.

a Building: Beijing, Shanghai, Tianjin, Chongqing. b Building: Guangzhou, Shenzhen, Wuhan, Chengdu. c Infrastructure: Beijing, Shanghai, Tianjin, Chongqing. d Infrastructure: Guangzhou, Shenzhen, Wuhan, Chengdu.