FY 2006 Global Carbon Cycle Sabine, C.L. In Encyclopedia of Life Sciences, John Wiley & Sons, Ltd., Chichester, doi: 10.1038/npg.els.0003489, http://www.els.net/ (doi: 10.1038/npg.els.0003) (2006) Recent scientific studies have greatly improved our understanding of carbon cycling at the Earth’s surface. The natural exchanges of carbon between the atmosphere, ocean and land are being significantly altered today by human activity. Feature Publications | Outstanding Scientific Publications Contact Sandra Bigley | Help