To date there are three complete formulations of Planetary Philosophy, in increasing length and depth.
A Philosophy for Our Times is the simplest and shortest version of Planetary Philosophy. If you want a quick overview, this is the version for you.
In Search of Philosophy puts Planetary Philosophy in the context of the field of philosophy and goes into more depth. Also, if you prefer picture-free text, try this version.
Finally, Planetary Philosophy – An Essay is the most complete formulation of Planetary Philosophy to date, locating Planetary Philosophy within the context of the field of philosophy, presenting a philosophy of science, a philosophy of consciousness, and a philosophy of capitalism. This is the full enchilada.
You can also download Planetary Philosophy – An Essay (PDF) in a PDF format.