| Acronym | Meaning |
 | HDGEC | Human Dimension Of Global Environment Change |
| ATC | Air Traffic Control |
| L | Lunar |
| DCO | Delayed Compliance Order |
| BBSO | Big Bear Solar Observatory |
| PAGES | Past Global Changes |
| MRI | Mesoscale Research Initiative |
| FBA | Forecasting By Analogy |
| ESSIS | Earth System Science Information System |
| OMTF | Optical Modulation Transfer Function |
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