| Acronym | Meaning |
 | GC-AED | Gas Chromatography-Atomic Emission Detection |
| GCA | Geophysics Corporation Of America |
| GCCDF | Generic Control Center Development Facility |
| GCCM | Global Carbone Cycle Modeling |
| GCDIS | Global Change Data And Information System |
| GCE | Part Of EUROTRAC |
| GCEC | Global Change And Ecological Complexity |
| GCI | Global Change Institute |
| GCIP | GEWEX Continental-Scale International Project |
| GCM | General Circulation Model |
| GCM | Global Change Model |
| GCM | General Circulation Model |
| GCMC | Global Climate Modeling Group |
| GCMG | Global Climate Modeling Group |
| GCMG | Global Climate Modeling Group |
| GCOS | Global Climate Observing System |
| GCP | Global Chemistry Program |
| GCP | Global Change Program |
| GCP | GEWEX Continental-Scale Project |
| GCRP | Global Change Research Program |
| GCSS | GWEX Cloud Systems Studies |
| GCTE | Global Change And Terrestrial Ecosystems |
| GCTE | Global Change And Terrestrial Ecosystems |
| GCTM | Global Chemical Transport Model |
| GDAS | Global Data Assimilation System |
| GDC | GARP Data Center |
| GDP | GARP Data Processing |
| GDP | Ground Data Processor |
| GDP | Gross Domestic Product |
| GDP | Government Development Platforms |
| GDPS | Global Data Processing System |
| GDR | Geophysical Data Record |
| GDS | Global Dynamics Section |
| GDS | GeoMet Data Services |
| GED | Global Ecosystem Dynamics |
| GEF | Global Environmental Facility |
| GEIA | Global Emissions Inventory Activity |
| GEISA | Management And Study Of Atmospheric Spectroscopic Information |
| GEM | Global Environmental Multiscale Model |
| GEM | Geospace Environment Modeling Program |
| GEMINI | General Mesonetwork Interpolation Interface |
| GEMPAK | General Meteorological Package |
| GEMS | Global Environment Monitoring System |
| GENESIS | Global Environmental And Ecological Simulation Of Interactive Systems |
| GENPRO | General Processor |
| GEO | Geosciences Directorate |
| GEO 2000 | National Science Foundation's Geosciences Beyond 2000 |
| GEOS | Geostationary Earth-Orbiting Satellite |
| GEOSAT | Geodesy Satellite |
| GEOSECS | Geochemical Ocean Sections |
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