1945

With the introduction of agriculture, man began to apply energy to control the growth of plants and animals, in order to make better use of the solar energy stored in plants by photosynthesis. For many thousands of years, the only energy he used for this purpose was his own human energy. The energy he drew from the biosphere was limited to the dietary energy provided by his food, and to the use of vegetation as fuel for heating and cooking. Later he learned to harness animal, water and wind energy in order to obtain power for transport and for simple agricultural and industrial processes. As his numbers grev, his use of energy increased steadily, but all of it came from renewable resources.

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