Contributions to accelerating atmospheric CO2 growth from economic activity, carbon intensity, and efficiency of natural sinks
Proceedings of the National Academy of Sciences (PNAS), published October 25, 2007, 10.1073/pnas.0702737104, Online Early Edition
Josep G. Canadell, Corinne Le Quere, Michael R. Raupach, Christopher B. Field, Erik T. Buitenhuis, Philippe Ciais, Thomas J. Conway, Nathan P. Gillett, R. A. Houghton, and Gregg Marland.
Carbon sink slowdown contributing to rapid growth in atmospheric CO2
This study finds that the recent swift increase in atmospheric CO2 is due to faster economic growth coupled with a halt in carbon intensity reductions, in addition to natural sinks removing a smaller proportion of emissions from the air. Efficiency of natural sinks to remove emissions from human activities has been declining for 50 years.
While rising anthropogenic emissions due to increased economic growth have been established as the driver of accelerated atmospheric CO2 this study shows that both the slow down of natural sinks and the halt to improvements in carbon intensity are contributing more than one third of the increase.
Analyses and Figures
Download paper from PNAS Early Edition (open access)
- Download a full PPT presentation with recent carbon trends and the global carbon budget updated to 2006:
- Global Carbon Project (doc, 107kb)
- CSIRO, Australia (or download doc, 48 kb)
- British Antartic Survey and University of East Anglia, UK (doc, 32kb)
- Proceedings of the National Academy of Science of the United States of America (doc, 38kb)
- EurekaAlert Public Release from Carnegie Institution
- Laboratoire des sciences du climat et de l’environnement (CEA-CNRS-UVSQ) (60kb)
- Radio interview with Chris Field - Canadian Radio One (or download mp3, 6Mb)
- News, Tv, Radio - Anglo World (pdf, 15 Mb)
- News, Tv, Radio - Non-Anglo World (pdf, 13 Mb)
|Illustrative Photos (available free if credited as specified)|
|A power station, Australia (jpg 615kb)
Credit CSIRO copyright,
Permission granted for media uses in relation to Canadell et al ( 2007) PNAS paper.
|Coal dredge at an open coal mine,
(jpg 853 kb)
Credit CSIRO copyright,
Permission granted for media uses in relation to Canadell et al (2007) PNAS paper.
Carbon sinks in tropical forest (jpg 1.43MB)
The cold and windy southern ocean (jpg 821kb)