TY - JOUR
T1 - Trends in urban land expansion, density, and land transitions from 1970 to 2010
T2 - A global synthesis
AU - Güneralp, Burak
AU - Reba, Meredith
AU - Hales, Billy U.
AU - Wentz, Elizabeth A.
AU - Seto, Karen C.
N1 - Funding Information:
This research was supported by NASA Land Cover/Land Use Change (LCLUC) grant NNX15AD43G. We thank Sydney Weyand, Cesar Castillo, Abir Chaudhuri, and Xunwei Xu for their help in data collection. The open access publishing fees for this article have been covered by the Texas AandM University Open Access to Knowledge Fund (OAKFund), supported by the University Libraries and the Office of the Vice President for Research
Publisher Copyright:
© 2020 The Author(s). Published by IOP Publishing Ltd.
PY - 2020/4
Y1 - 2020/4
N2 - The physical expansion of urban areas lead to lasting impacts on landscapes and livelihoods. Here, we conduct a global synthesis of trends in urban land expansion, in urban population densities, and lands converted into urban from 1970 to 2010. We find that small-medium urban areas lead their larger counterparts in both rates of urban land expansion and decreases in urban population densities. Urban population densities have consistently declined only in India, China, North America, and Europe with significant exceptions across city sizes. Over 60% of the reported urban expansion was formerly agricultural land with China, Southeast Asia, and Europe in the lead. Counterfactual analysis suggests that, due to the decrease in urban population densities, an estimated 125 000 km2 land was converted to urban land uses that could have otherwise remained in cultivation or as natural vegetation. In particular, in India and Nigeria, with much of their populations dependent on agriculture, 85% and 30% more land, respectively, was converted to urban land due to decreasing urban population densities. With increasing urbanization, proactive management of urban land expansion, especially in small and medium cities, will be critical for saving agricultural lands in peri-urban regions while creating equitable and affordable urban landscapes.
AB - The physical expansion of urban areas lead to lasting impacts on landscapes and livelihoods. Here, we conduct a global synthesis of trends in urban land expansion, in urban population densities, and lands converted into urban from 1970 to 2010. We find that small-medium urban areas lead their larger counterparts in both rates of urban land expansion and decreases in urban population densities. Urban population densities have consistently declined only in India, China, North America, and Europe with significant exceptions across city sizes. Over 60% of the reported urban expansion was formerly agricultural land with China, Southeast Asia, and Europe in the lead. Counterfactual analysis suggests that, due to the decrease in urban population densities, an estimated 125 000 km2 land was converted to urban land uses that could have otherwise remained in cultivation or as natural vegetation. In particular, in India and Nigeria, with much of their populations dependent on agriculture, 85% and 30% more land, respectively, was converted to urban land due to decreasing urban population densities. With increasing urbanization, proactive management of urban land expansion, especially in small and medium cities, will be critical for saving agricultural lands in peri-urban regions while creating equitable and affordable urban landscapes.
KW - Global environmental change
KW - Land change science
KW - Land use
KW - Land use efficiency
KW - Urban planning
KW - Urban sustainability
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U2 - 10.1088/1748-9326/ab6669
DO - 10.1088/1748-9326/ab6669
M3 - Article
AN - SCOPUS:85083630537
SN - 1748-9318
VL - 15
JO - Environmental Research Letters
JF - Environmental Research Letters
IS - 4
M1 - 044015
ER -