Human Population Reaches 7 Billion

The human population requires a host of natural resources, from vast copper mines to ever more land for food. More area was converted to growing crops between 1950 and 1980, than from 1700 to 1850, and  land is one of nine “planetary boundaries” that are exceeded by humanity. The others include climate change, biodiversity loss, nutrient cycles, ocean acidification and freshwater use.

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