Ever since 1492, the hemispheres have become more and more alike, as people mix the world’s organisms into a global stew. Thus bananas and coffee, two African crops, become the principal agricultural exports of Central America; maize and manioc, domesticated in Mesoamerica and Amazonia respectively, return the favor by becoming staples in tropical Africa. Meanwhile, plantations of rubber trees, an Amazon native, undulate across Malaysian hillsides; peppers and tomatoes from Mesoamerica form the culinary backbones of Thailand and Italy; Andean potatoes lead Ireland to feast and famine; and
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