Part of the speculative Solar Share project that is at the heart of “Post Growth,” the Solar Share: Energy Flow Diagram attempts a ‘deep sustainability analysis’ that encompasses all human and non-human contributions. At the top are epochal sources related to the big bang, solar radiation, reserved deep heat, and chemical properties in the materiality of the Earth. Extending from these rich sources that provide all the energy for the nutritive and technical needs of human beings today, are long-term cyclical processes which eventually furnish everything we consume. Framing the central diagram are representations of waste and entropic dissolution—both black boxes unto themselves, whose complexity extends beyond the scope of this schematic.