We have been overeating the fat of the land in the form of fossil fuel and standing forests, and it is hurting the ecosystem. In this way, humans are not self-sufficient, we are addicted to high-octane energy sucked from our host.
We ought to collect energy and produce our own fat, but fat is expensive for an organism to synthesize; it means conversion and storage mechanisms, more structure. Fat means saving from one day to the other, season to season, year to year. Grain silos are fat. Thermal aquifers are fat. Hydrogen could be a form of fat.
Sustainability is just a change in metabolism.
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