Philosophy isn't reading Emmanuel Kant. Philosophy is about thinking hard about what the right thing to do is in a situation and approaching that kind of question in an open-minded and open-hearted way, receptive to a broad range of considerations and interests of other people and other things.
Philosophy is not a body of knowledge to impart to someone, that's why reading philosophy books isn't always the best way of learning philosophy. Philosophy is really more the process of rational engagement, rational reflection with a diversity of views and ideas and opinions and trying to sort of reason your way through to a more reflective position. I think if you look at it that way, philosophizing is to some extent some small way a part of almost everyone's lives although they don't recognize it as such and a lot of people are embarrassed about it.
Environmental philosophy just is philosophy full stop. It only sprung up as distinct subfield because mainstream philosophy was ignoring some of the most important philosophical challenges of our time.
We think of history as another specialization, like philosophy of language, rather than as something that informs everything we do and think.
Even those who specialize in the history of philosophy often ignore the political and cultural context, and the natural world in which their philosophers were philosophizing. This has consequences both trivial and important. If you systematically read the last fifty years of the major journals in our discipline you would be amazed at the amount of redundancy. Most of this is unacknowledged because most of us know so little about the history of our discipline and even the subfields in which we work.
A great deal of our math, science, philosophy, and everyday behavior presupposes that stability and equilibria are the "default" states, and everything else involves some "perturbation." This is a mental model, a conceptual frame, a tacit belief, a presupposition - whatever you want to call it.
Most "process" philosophy is historicist (e.g., Hegel) and not concerned with "deep time." Maybe Whitehead is an exception. He may be a really important philosopher for all I know. I've never been able to read him.
The most fundamental challenge of the anthropocene concerns agency. For those who lived the Enlightenment dream (always a minority but an influential one), agency was taken for granted. There were existential threats to agency (e.g., determinism) but philosophy mobilized to refute these threats (e.g., by defending libertarianism) or to defuse them (e.g., by showing that they were compatible with agency).
The Consequentialist trinity is typically regarded in this way: Bentham is crude, Mill's writings are full of howlers and inconsistencies, and Sidgwick was too smart to fully embrace Consequentialism. All of these great traditions in moral philosophy express strands of our moral consciousness and they should all be treated as research programs rather than as fully determinate views that can be leveled by a counterexample or by a clever argument.
