Fig. 4 City sectors ranked by per-industrial output emissions. City sectors ranked by per-industrial output emissions. Emission-Lorenz curve of 7098 industrial city sectors (A) and top/bottom 10 city sectors in per–industrial output emission (B and C). The numbers alongside the y axis in (B) and (C) are the per–industrial output emissions of the city sectors. The numbers in parentheses after the city name denote the sectors of the cities, which are consistent with the sectors’ ID number in table S2. The colors of the bars indicate the city sectors’ categories (red, energy production; orange, heavy manufacturing; yellow, light manufacturing; green, high-tech industry). For example, Shangqiu (20) in (B) refers to the “petroleum processing and coking” sector of Shangqiu and belongs to energy production (red); Beijing (34) in (C) refers to the “electronic and telecommunications equipment” sector of Beijing and belongs to the high-tech industry (green). Yuli Shan et al. Sci Adv 2018;4:eaaq0390 Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).