There are numerous synonyms available for the phrase "concerning the earth". Some possible alternatives include "pertaining to the planet", "related to the environment", "regarding the world", "about the globe", "connected with nature", "touching upon the ecosystem", and "dealing with the earth's ecology". These alternative phrases can be used to convey the same meaning as "concerning the earth", but with slightly different nuances. For example, "pertaining to the planet" may suggest a scientific or astronomical focus, while "related to the environment" might emphasize the impact of human activities on the natural world.