Volume 1, Issue 1, Pages 126-137 (September 2019) Mapping Carbon and Water Networks in the North China Urban Agglomeration  Heran Zheng, Zongyong Zhang, Zengkai Zhang, Xian Li, Yuli Shan, Malin Song, Zhifu Mi, Jing Meng, Jiamin Ou, Dabo Guan  One Earth  Volume 1, Issue 1, Pages 126-137 (September 2019) DOI: 10.1016/j.oneear.2019.08.015 Copyright © 2019 Elsevier Inc. Terms and Conditions

One Earth 2019 1, 126-137DOI: (10.1016/j.oneear.2019.08.015) Copyright © 2019 Elsevier Inc. Terms and Conditions

Figure 1 Main Supply Chain for the Jing-Jin-Ji Urban Agglomeration The width of the arrows in the figure indicates the magnitude of the net flow. The colors in the regions represent cities as net exporters or importers, and the sizes of the circles represent the magnitude. Carbon and water chains are listed in terms of net carbon flows to other cities. (A) Black refers to carbon consumers with net inflows from other cities, while red refers to suppliers with a net supply to other cities in terms of magnitude. (B) Blue refers to water consumers with net inflows from other cities, and yellow refers to suppliers with a net supply to other cities in terms of magnitude. The number on the left of the circle represents the number of net city suppliers for downstream cities and the number of cities supplied for upstream cities (arrows represent net flow). One Earth 2019 1, 126-137DOI: (10.1016/j.oneear.2019.08.015) Copyright © 2019 Elsevier Inc. Terms and Conditions

Figure 2 Net Emission Flows Versus Net Water Flows for 13 Cities in the North China Urban Agglomeration The size of a circle represents carbon intensity (per GDP carbon emissions), indicating energy efficiency. The color of a circle represents water intensity (per GDP water usage), indicating water efficiency. Blue indicates a higher-than-average water intensity, and red indicates a lower-than-average water intensity. One Earth 2019 1, 126-137DOI: (10.1016/j.oneear.2019.08.015) Copyright © 2019 Elsevier Inc. Terms and Conditions

Figure 3 Share of Carbon Emissions, Water Consumption, and Value Added Embodied in Trade Value added embodied in trade is seen as a benefit from trade-led production, while embodied carbon and water are expenses in trade. One Earth 2019 1, 126-137DOI: (10.1016/j.oneear.2019.08.015) Copyright © 2019 Elsevier Inc. Terms and Conditions

Figure 4 Heavy, Energy, and Agriculture Sectors that Shape the Carbon and Water Chain in the Urban Agglomeration Carbon flows for heavy industry (A), carbon flows for the energy industry (B), water flows for agriculture (C), and water flows for heavy industry (D). The chart from left to right means that the carbon emitted or water used where the city (left bar) was driven by the final demand of the city (right bar) for the products in the sector (middle bar). Downstream cities also take a large part in production. To distinguish the downstream and upstream cities, we use the color gray to indicate the downstream cities (unit is one million tons). Notably, CN, HV, SV, LT, and AG represent construction, heavy industry, services, light industry, and agriculture, respectively (for sector classification, see Table S1). One Earth 2019 1, 126-137DOI: (10.1016/j.oneear.2019.08.015) Copyright © 2019 Elsevier Inc. Terms and Conditions