There isn't one single, universally accepted abbreviation for the science of the Earth and its inhabitants. However, you could use:

* ES for Earth Science

* GE for Geography

* ENV for Environmental Science

* EO for Earth Observation

Ultimately, the best abbreviation would depend on the specific context and what you want to emphasize.

For example, if you're talking about the study of the Earth's physical systems, "ES" might be appropriate. If you're focusing on human interactions with the environment, "ENV" might be a better choice.