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Global Carbon Project
Scientific partnership that aims to develop a complete picture of the global carbon cycle, including both its biophysical and human dimensions together with the interactions and feedbacks between them. A project of the Earth System Science Partnership of the International Geosphere Biosphere Programme (IGBP), World Climate Research Programme (WCRP), and the International Human Dimensions Programme (IHDP)
http://www.globalcarbonproject.org/
US Carbon Cycle Science Program
An interagency partnership to provide critical unbiased scientific information on the fate of carbon dioxide in the environment to contribute to the ongoing public dialogue.
http://www.carboncyclescience.gov/