As every medical student comes to learn when first dissecting the human body at medical school, our limbs are almost entirely composed of muscles.
Without this ensemble of fitness in nature, there would be no wood, no fire, no metallurgy, no modern technology.
Without lignin, there would be no woody plants, no wood, no coal, no charcoal, no fire, no pottery, and certainly no iron or metallurgy.
There is another aspect of the Earth’s environment that is absolutely crucial in allowing the utilization of fire for metal-based technologies.
The combustion of wood or coal may seem so familiar as to be unworthy of any comment.