In Fig. 3, the peak energy consumption and carbon emission of Bitcoin industry are compared to national level emissions of other countries as well as to the emissions of domestic cities and industrial sectors in China. Annual energy consumption and ranking by countries a are obtained from cia.gov (www.cia.gov), carbon emission and ranking by countries b are collected from global carbonatlas (www.globalcarbonatlas.org). The carbon emission by Chinese cities (c) and industrial sectors (d) are obtained from China Emission Accounts and Datasets (www.ceads.net). Due to the unreleased or missing data in some database, the above energy consumption and carbon emission data are obtained for 2016 level.