In 1903, there were nearly 500 varieties of lettuce. In 1983, there were just 36 left. The decline in lettuce types are typical of the loss in variety of majority of our food seeds.

As humans have meddled with nature, our food's diversity has declined. According to National Geographic, the industrialization of agriculture and our focus on getting the highest yield per acre has led to a 93% decline in the diversity of our food seeds. Big Think

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