Khan Academy Static

All living things need energy to survive. For a long time, humans met their energy needs almost exclusively by eating the food they foraged in their local environment. In other words, humans were completely dependent on the plants and animals that nature provided. The invention of farming about 12,000 years ago gave humans access to vast new food and energy resources, which helped to dramatically transform the way humans lived. Among other things, farming made possible dramatic population growth, and it allowed humans to settle in larger, denser communities than a foraging lifestyle could support. These larger and denser communities eventually led to the development of cities and civilizations, which accelerated collective learning and innovation.

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