| Abbreviation | Definition |
|---|---|
| GCIP | GEWEX Continental-scale International Project |
| GCM | General Circulation Model |
| GCMD | Global Change Master Directory |
| GCOS | Global Climate Observing System |
| GCPS | Global Climate Perspectives System |
| GCRP | Global Change Research Plan/Program |
| GCTE | Global Change and Terrestrial Ecosystems |
| GCTM | Global Chemical Transport Model |
| GD | Geographical Descriptor |
| GDC | Global Drifter Center |
| GDD | Growing Degree Days |
| GDP | Government Development Platform |
| GDPS | Global Data Processing System |
| GDSIDB | Global Digital Sea Ice Data Bank |
| GE | Global Environment |
| GEBA | Global Energy Balance Archive |
| GEBCO | General Bathymetric Chart of the Oceans |
| GEC | Global Environmental Change |
| GEEP | Group of Experts on Effects of Pollutants |
| GEF | Global Environmental Facility |