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Contributions to accelerating atmospheric CO 2 growth from economic activity, carbon intensity, and efficiency of natural sinks
Open accessAbstract
The growth rate of atmospheric carbon dioxide (CO 2 ), the largest human contributor to human-induced climate change, is increasing rapidly. Three processes contribute to this rapid increase. Two of these processes concern emissions. Recent growth of the world economy combined with an increase in its carbon intensity have led to rapid growth in fossil fuel CO 2 emissions since 2000: comparing the 1990s with 2000–2006, the emissions growth rate increased from 1.3% to 3.3% y −1 . The third process is indicated by increasing evidence ( P = 0.89) for a long-term (50-year) increase in the airborne fraction (AF) of CO 2 emissions, implying a decline in the efficiency of CO 2 sinks on land and oceans in absorbing anthropogenic emissions. Since 2000, the contributions of these three factors to the increase in the atmospheric CO 2 growth rate have been ≈65 ± 16% from increasing global economic activity, 17 ± 6% from the increasing carbon intensity of the global economy, and 18 ± 15% from the increase in AF. An increasing AF is consistent with results of climate–carbon cycle models, but the magnitude of the observed signal appears larger than that estimated by models. All of these changes characterize a carbon cycle that is generating stronger-than-expected and sooner-than-expected climate forcing.
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“Tropical ecosystems store an enormous 340 billion tonnes of carbon (Gibbs et al 2007), equivalent to more than 40 times the total annual anthropogenic emissions from fossil fuel combustion (Canadell et al 2007).”
From Carbon payback times for crop-based biofuel expansion in the tropics: the effects of changing yield and technology (2008) · cites this paper as Canadell et al 2007
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“The anthropogenic climate forcing has accelerated since the beginning of the 21st century, mainly due to growing global economy and reduced absorbing efficiency of land and ocean CO 2 sinks (Canadell et al., 2007).”
From Artificial intelligence for climate prediction of extremes: State of the art, challenges, and future perspectives (2024) · cites this paper as Canadell et al., 2007
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“This corresponds to 34% of the total 478 GtC emitted by humans between 1850 and 2005”
From Greenhouse gas mitigation by agricultural intensification (2010) · cites this paper as [11]
In the citing paper
“In the same year, land use change (e.g., harvesting of forest products and clearing for agriculture) accounted for an additional 1.5 GtC emissions”
From Greenhouse gas mitigation by agricultural intensification (2010) · cites this paper as [11]
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“This corresponds to 18% of the total 478 GtC emitted by humans between 1850 and 2005”
From Greenhouse gas mitigation by agricultural intensification (2010) · cites this paper as [11]
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Metadata
- Authors
- Canadell, J. G., Le Quéré, C., Raupach, M. R., Field, C. B., Buitenhuis, E. T., Ciais, P., Conway, T. J., Gillett, N. P., Houghton, R. A., & Marland, G.
- Affiliations
- Commonwealth Scientific and Industrial Research Organisation (AU)
- School of Environment Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom;
- Carnegie Institution for Science (US)
- University of East Anglia (GB)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- National Oceanic and Atmospheric Administration (US)
- Woodwell Climate Research Center (US)
- Oak Ridge National Laboratory (US)
- ORCID
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2007-11-20
- Volume
- 104
- Issue
- 47
- Pages
- 18866-18870
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC2141868
- OpenAlex
- W2133920545
- Cited by
- 2,136
- References
- 31
- Citations by year
- 2026: 45 · 2025: 69 · 2024: 73 · 2023: 89 · 2022: 99 · 2021: 93 · 2020: 87 · 2019: 104 · 2018: 94 · 2017: 115 · 2016: 115 · 2015: 140 · 2014: 132 · 2013: 168 · 2012: 121
- FWCI
- 116.17
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- IIASA PURE (International Institute of Applied Systems Analysis) (submittedVersion)
- HAL (submittedVersion)
- Max Planck Institute for Plasma Physics (submittedVersion)
- NERC Open Research Archive (Natural Environment Research Council) (submittedVersion)
- MPG.PuRe (Max Planck Society) (submittedVersion)
- UEA Digital Repository (University of East Anglia) (submittedVersion)
- Funders
- European Commission
- Commonwealth Scientific and Industrial Research Organisation
- Natural Environment Research Council (NE/C516079/1, bas010013)
- Topics
- Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric and Environmental Gas Dynamics
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Climate Change Policy and Economics
- Keywords
- atmospheric CO2 growth rate, carbon intensity, economic growth, fossil fuel CO2 emissions, carbon sink, ocean carbon uptake, land carbon uptake, radiative forcing, anthropogenic CO2 emissions
- MeSH terms
- Atmosphere, Carbon, Carbon Dioxide, Fossil Fuels, Time Factors, Greenhouse Effect, Ecosystem
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