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Life leaves our planet as we take it over.
Our biosphere, its living constituents, and the workings of human societies have laws of large numbers and bulk averages. This is important, because our crisis planetary ecology is entirely the fault of our exponential growth. Gaia has never before been hit so hard and fast from within. Humanity is fast engineering its massive destructive coup of all life systems. Gaia is our solar energy renewed biosphere, our very thin crust,oceans and atmosphere of life-compatible chemistry and temperatures, that wraps our planetary sphere.
Human cultural systems are so dominant that we are clearing everything else out. We have large numbers of people acting across large areas, consuming ever more massive amounts of energy, mining the crust. We are piling up and spreading our toxic chemical wastes.
How much is left, and how long can it last? I can do simple school geographical area exercise. Or just lookup https://ourworldindata.org/global-land-for-agriculture
The size scales of our sphere are about 40,000 kilometres circumference, and 510 million kmsq of surface area. 71% is our oceans, so 29% is land. Round up a little the total land area, all continents and smaller islands for a total 149 million kmsq. Subtract Antarctica, and the ice sheet area of Greenland, (14.2 and 1.7) and realize that there is also a lot of barren land…