It turns out (thank Ingrid!) that Tristan Garcia, French OO philosopher and novelist and etc., is putting a book together about solidarity between humans and nonhumans too, addressing Marxism! So this topic is in the air. I really hope one day we can talk about it in public together.
Such a good job, because the books that are currently out there are disturbingly teleological, anthropocentric and even transhumanist (which might be the most insulting adjective I use in the academy lol).