The role of urbanization in the global carbon cycle

Frontiers in Ecology and Evolution. 2016;3 DOI 10.3389/fevo.2015.00144

 

Journal Homepage

Journal Title: Frontiers in Ecology and Evolution

ISSN: 2296-701X (Online)

Publisher: Frontiers Media S.A.

LCC Subject Category: Science: Biology (General): Evolution | Science: Biology (General): Ecology

Country of publisher: Switzerland

Language of fulltext: English

Full-text formats available: PDF, HTML, XML

 

AUTHORS

Galina eChurkina (Institute for Advanced Sustainability Studies)
Galina eChurkina (Humboldt University)

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 12 weeks

 

Abstract | Full Text

Urban areas account for more than 70% of CO2 emissions from burning fossil fuels. Urban expansion in tropics is responsible for 5% of the annual emissions from land use change. Here I show that the effect of urbanization on the global carbon cycle extends beyond these emissions. I quantify the contribution of urbanization to the major carbon fluxes and pools globally and identify gaps crucial for predicting the evolution of the carbon cycle in the future. Urban residents currently control ~22 (12-40) % of the land carbon uptake (112 PgC/yr) and ~24 (15-39) % of the carbon emissions (117 PgC/yr) from land globally. Urbanization resulted in the creation of new carbon pools on land such as buildings (~6.7 PgC) and landfills (~30 PgC). Together these pools store 1.6 (±0.3) % of the total vegetation and soil carbon pools globally. The creation and maintenance of these new pools has been associated with high emissions of CO2, which are currently better understood than the processes associated with the dynamics of these pools and accompanying uptake of carbon. Predictions of the future trajectories of the global carbon cycle will require a much better understanding of how urban development affects the carbon cycle over the long term.