| Abbreviation | Definition |
|---|---|
| CLGD | Climate Law and Governance Day |
| CLIM | Climate |
| CLIP | CLimate Infrastructure Partnership |
| CMDA | Climate Model Diagnostic Analyzer |
| CMDP | Climate Migration and Displacement Platform |
| CMIA | Climate Markets and Investment Association |
| CMIP | Climate Model Intercomparison Project |
| CMUG | Climate Modelling User Group |
| CNFA | Climate Niche Factor Analysis |
| COCA | Coastal and Ocean Climate Applications |
| COIC | Chinese organizational innovation climate |
| COSIM | Climate Ocean and Sea Ice Modeling |
| COSMIC | Constellation Observing System for Meteorology Ionosphere and Climate |
| CPAI | Challenge Program for Adaptation Innovation |
| CPCCA | Coastal Protection for Climate Change Adaptation |
| CPCM | Center for Prototype Climate Modeling |
| CPCUT | Climate Pledge Collective University of Toronto |
| CPEIR | Climate Public Expenditure and Investment Review |
| CPI | Climate Policy Initiative |
| CPO | Climate Program Office |