About page states:
The Carbon Dioxide Information Analysis Center (Thomas A. Boden, Director), which includes the World Data Center for Atmospheric Trace Gases, has served as the primary climate-change data and information analysis center of the U.S. Department of Energy (DOE) since 1982.
CDIAC responds to data and information requests from users worldwide investigating the greenhouse effect and global climate change. CDIAC's data holdings include records of the concentrations of carbon dioxide and other radiatively active gases in the atmosphere; the role of the terrestrial biosphere and the oceans in the biogeochemical cycles of greenhouse gases; emissions of carbon dioxide to the atmosphere; long-term climate trends; the effects of elevated carbon dioxide on vegetation; and the vulnerability of coastal areas to rising sea level.
There is a wealth of data here, please add direct links to the more useful/accessible/important datasets. Much of the data is assembled / copied from other sources.
There is a search interface for the datasets here: http://mercury.ornl.gov/cdiac/
Appears not to be open, as contracted from Federal Government to third party. Disclaimer states:
Documents provided from the web server were sponsored by a contractor of the U.S. Government under contract DE-AC05-00OR22725. Accordingly, the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce these documents, or to allow others to do so, for U.S. Government purposes. These documents may be freely distributed and used for non-commerical, scientific and educational purposes.
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Carbon Dioxide Information Analysis Center (CDIAC) Data. No author.
Retrieved 17:38, May 21, 2013 (UTC).
the Data Hub