Substantial terrestrial carbon emissions from global expansion of impervious surface area

Linghua Qiu, Junhao He, Chao Yue (), Philippe Ciais and Chunmiao Zheng
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Linghua Qiu: Northwest A&F University
Junhao He: Northwest A&F University
Chao Yue: Northwest A&F University
Philippe Ciais: Université Paris-Saclay
Chunmiao Zheng: Southern University of Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Global impervious surface area (ISA) has more than doubled over the last three decades, but the associated carbon emissions resulting from the depletion of pre-existing land carbon stores remain unknown. Here, we report that the carbon losses from biomass and top soil (0–30 cm) due to global ISA expansion reached 46–75 Tg C per year over 1993–2018, accounting for 3.7–6.0% of the concurrent human land-use change emissions. For the Annex I countries of UNFCCC, our estimated emissions are comparable to the carbon emissions arising from settlement expansion as reported by the national greenhouse gas inventories, providing independent validation of this kind. The contrast between growing emissions in non-Annex I countries and declining ones in Annex I countries over the study period can be explained by an observed emerging pattern of emissions evolution dependent on the economic development stage. Our study has implications for international carbon accounting and climate mitigation as it reveals previously ignored but substantial contributions of ISA expansion to anthropogenic carbon emissions through land-use effects.

Date: 2024
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DOI: 10.1038/s41467-024-50840-w

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