Except this is not Charles Darwin's "accidental" evolution by random mutation and natural selection.
It is Herbert Spencer's Social Darwinism - eugenics; a targeted culling of the herd: deliberate social engineering that willfully sacrifices the people; renders the population redundant, superfluous, expendable.
The machines are not actually "sustainable". Indeed, the machines are the cause of the unsustainability problem.
Human workers are muscle-powered and food-fueled. Food - especially organically grown plant-based food - is a clean green renewable energy source to fuel human workers. Small-scale organic farming is knowledge-based and highly productive but labor intensive - economically smart but financially inefficient - so billions of food-fueled humans doing the work of growing food are replaced by millions of giant fossil-fueled machines doing the work of industrial-scale corporate agribusiness.
The industrial and agricultural machines are motor-powered and fossil-fueled or electric-fueled. Burning the Earth's limited supply of non-renewable fossil fuels, and digging out the Earth's limited supply of non-renewable natural resources to build the electricity-generating infrastructure and to build all the machines, is polluting the planet and consuming the Earth's non-renewable resources at an unsustainable rate.
Human labor is naturally fueled, clean, renewable, and sustainable.
Machine labor is artificially fueled, polluting, non-renewable, and unsustainable.
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