G
Geremia
Guest
Does it? I find the laicized Catholic priest Ivan Illich’s work Energy and Equity (View attachment 4586) very interesting. In it he shows thatFood depends on oil and natural gas
Man, unaided by any tool, gets around quite efficiently. He carries one gram of his weight over a kilometer in ten minutes by expending 0.75 calories. Man on his feet is thermodynamically more efficient than any motorized vehicle and most animals. For his weight, he performs more work in locomotion than rats or oxen, less than horses or sturgeon. At this rate of efficiency man settled the world and made its history. At this rate peasant societies spend less than 5 per cent and nomads less than 8 per cent of their respective social time budgets outside the home or the encampment.
Humans bodies are very efficient machines and much more so when coupled to a man-powered bicycle. If 1 gallon of regular unleaded gasoline contains 31,520 kilocalories (food calories) of energy, and cars average 25 miles per gallon, then it takes cars 783 kcal to go 1 kilometer. If man weighs 80 kilograms on average, then with a bicycle man only uses 12 kilocalories to go 1 kilometer, or about 65 times more efficient than an automobile. Man is 5 times less efficient without a bicycle but still 13 times more efficient than an automobile. If there is roughly 1 automobile per 11 people worldwide, then earth’s resources without automobiles could support about 14.6 billion people, assuming that 1 automobile strains the environment as much as 13 people, that there are currently 6.7 billion people worldwide, and that we are currently maximally straining our environment’s resources.Man on a bicycle can go three or four times faster than the pedestrian, but uses five times less energy in the process. He carries one gram of his weight over a kilometer of flat road at an expense of only 0.15 calories. The bicycle is the perfect transducer to match man’s metabolic energy to the impedance of locomotion. Equipped with this tool, man outstrips the efficiency of not only all machines but all other animals as well.