Inquiry can easily be used in an ecopsychology context.
Specifically how depends on the person and his or her situation.
For people concerned about our current ecological situation, we can look at fear, stress, a sense of inadequacy etc.
For people worried they are not doing enough, we can look at guilt, shame, fear, and commands to do more (or less!).
For people caught up in us vs them thinking, we can look at identities and perceived boundaries creating this sense of division and separation.
For people who want to experience a deeper connection with nature, we can look at identities with a charge that creates a sense of separation.
There is no end to possibilities. It would be fun to do a workshop on this one day. It could perhaps be combined with Practices to Reconnect developed by Joanna Macy.