Climate Data
Surface data
Satellite data
Air pollutants / emissions / ozone / aerosols
| AERONET | AErosol RObotic NETwork program (NASA) | 
| CDIAC | Carbon Dioxide Information Analysis Center | 
| EMEP | European Monitoring and Evaluation Programme also http://tarantula.nilu.no/projects/ccc/network/index.html | 
| GEIA-ACCENT | The Global Emissions Inventory Activity (GEIA) Atmospheric Composition Change: the European Network (ACCENT) | 
| NCAR-ACD | NCAR Atmospheric Chemistry Division | 
| WDCGG | World Data Centre for Greenhouse Gases Measurements of greenhouse and related trace gas species (WMO) | 
| WRI | Earth trends The Environmental Information Portal | 
| WOUDC | World Ozone and Ultraviolet Radiation Data Centre (WMO) | 
Ocean data
GOOS Global Ocean Observing System
Terrestial data
GTOS Global Terrestial Observing System also http://www.fao.org/gtos/GT-NET.html
Proxies and reconstructions / indirect data
| ACRE | Atmospheric Circulation Reconstructions over the Earth | 
| CLIWOC | Climatological Database for the World's Oceans 1750-1850 | 
| GCMD | Global Change Master Discovery (NASA) | 
Climate extreme indices
| CLIVAR/ETCCDI | CLIVAR (Climate Variability and Predictability) project Expert Team on Climate Change Detection and Indices | 
| ECA&D | European Climate Assessment & Dataset project | 











