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The race to save endangered foods

Here’s a stat for you: In 1903, seed catalogs offered American farmers a choice of 307 varieties of sweet corn. Today, just 12 of those varieties are still commercially available. A similar trend is visible in China, where more than 90 percent of native wheat varieties have been lost, and in Mexico, which has lost more than 80 percent of the varieties of maize, or corn, that were once grown there.