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Agriculture

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sweet potatoes

HOW SWEET  Long before humans inhabited Polynesia, sweet potatoes may have been carried across the ocean from South America to the South Pacific islands by wind, water or maybe even birds.

peatland fire in Indonesia

SMOKE SIGNALS  Peatland fires in Riau Province, Indonesia, burned in August 2016, releasing stored carbon into the atmosphere. Climate change and agriculture are putting peatlands at risk.

cacao flowers

FLOWERS FOR CHOCOLATE  Pale petals curl over a cacao flower’s male parts. Here, two developing fruits, or seedpods (top left), will eventually ripen, housing the seeds that give the world chocolate.

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