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Jessica Eise, Purdue University and Natalie White, Purdue University

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In Colombia’s coffee-producing region of Risaralda, small trees run along the sharp incline of the Andes Mountains, carefully tended in tidy rows. Thousands of green coffee berries turn brilliant red as they ripen, ready to be harvested by hand. The steep hills here prevent mechanized techniques.

Its unique geography makes Colombia one of the world’s greatest coffee-producing na...