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2016-01-11Zeitschriftenartikel DOI: 10.3389/fevo.2015.00144
The Role of Urbanization in the Global Carbon Cycle
Churkina, Galina cc
Mathematisch-Naturwissenschaftliche Fakultät
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/year) 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.
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DOI
10.3389/fevo.2015.00144
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https://doi.org/10.3389/fevo.2015.00144
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<a href="https://doi.org/10.3389/fevo.2015.00144">https://doi.org/10.3389/fevo.2015.00144</a>