A friend recently introduced me to
Orion magazine. It's not a poetry journal, but an environmental magazine that publishes some poems. I don't know that every poet they publish is exclusively or primarily an "ecopoet" (although my initial impression is that that's the case with Teddy Macker, who wrote "The Otters and the Seaweed") but if you check the contributors' bios, you might find the sort of books you're looking for.
https://orionmagazine.org/poetry/