| Abbreviation | Definition |
|---|---|
| CFS | Climate Forecast System |
| CFSR | Climate Forecast System Reanalysis |
| CFTF | Climate Finance Task Force |
| CFTM | Climate Finance Transparence Mechanism |
| CFTM | Climate Finance Transparency Mechanism |
| CGD | Climate and Global Dynamics |
| CHG | Climate Hazards Group |
| CHN | Climate History Network |
| CHSP | Climate and Human Systems Project |
| CIG | Climate Impacts Group |
| CIQ | Climate for Innovation Questionnaire |
| CIRC | Climate Impacts Research Consortium |
| CIRCA | Center for Initiatives and Research on Climate Adaptation |
| CIRCA | Connecticut Institute for Resilience and Climate Adaptation |
| CJL | Climate Justice League |
| CKB | Climate Knowledge Brokers |
| CLAMP | Climate Leaf Analysis Multivariate Program |
| CLEO | Climate Leadership Engagement Opportunities |
| CLEW | Climate Land Energy and Water |
| CLEW | Climate Legislative and Executive Workgroup |