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"The US has commercial agriculture, while India relies on intensive, subsistence farming. It's a question of the livelihoods of millions of Indians versus the interests of US agribusiness."

The change forced many Mexican farmers to shift to subsistence farming or to take up seasonal work far from their homes.

Salmon are not only a mainstay of commercial and recreational fishing businesses, but are also central to the cultures of Native tribes, who continue traditions of subsistence fishing.

More than 30 Alaska Native villages depend on the Kuskokwim for their subsistence living.

The growing popularity of the nutritious “superfood” among health food advocates has transformed the traditional subsistence crop into an important export commodity, providing much needed income to one of the poorest areas of Peru.