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In page Third Pole:

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The Third Pole area is rich with natural resources and consists of all or some of four global biodiversity hotspots. The mountain resources administer a wide range of ecosystem benefits and are the base for the drinking water, food production and livelihoods of the 220 million inhabitants of the region, as well as indirectly to the 1.5 billion people [3] — one sixth of the world's population — living in the downstream river basins. Billions of people benefit from the food and energy produced in these river basins whose headwaters rely on meltwaters and precipitations that run off these mountains.[citation needed]