Concerned with eco travel, helping the environment (9)
I believe the answer is:
recycling
'helping the environment' is the definition.
The answer and definition can be both related to consumption as well as being present participle verbs.
Maybe there's an association between them I don't understand?
'concerned with eco travel' is the wordplay.
I cannot really understand how this works, but
'concerned with' could be 'in' (I've seen this in other clues) and 'in' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for recycling that I've seen is " Activity of green".)