| Abbreviation | Definition |
|---|---|
| GGTN | Global Gas Turbine Newsletter |
| GGWS | Great Global Warming Swindle |
| GHG | Green House Gases |
| GHG2E | Green House Gasses conversion To Energy |
| GHGE | Green House Gas Emision |
| GHGE | GreenHouse Gas Emissions |
| GHGR | Green House Gas Reporting |
| GIACC | Group on International Aviation and Climate Change |
| GIEC | Georgia Industry Environmental Coalition |
| GIRO | Gabriola Island Recycling Organization |
| GIRR | Galiano Island Recycling Resources |
| GL | Green Lung |
| GLAP | Great Lakes Action Plan |
| GLBP | Great Lakes Basin Program |
| GLC | Ground Level Concentration |
| GLEA | Geneva Lake Environmental Agency |
| GLEAM | Great Lakes Environmental Assessment and Mapping |
| GLEC | Great Lakes Environmental Center |
| GLEI | Great Lakes Environmental Indicators |
| GLOBE | Global Legislatures Organisation for Balanced Environment |