Throughout history, food needs bonded humans to nature. The transition to agriculture constituted slow, but revolutionary ecological transformations. After 1500 ce, agricultural goods, as well as pests that undermined them, dominated the exchange of species between four continents. In the United States, increasingly more commercial efforts simplified ecosystems. Improved technologies and market mechanisms facilitated surpluses in the 19th century that fueled industrialization and urbanization. In the 20th century, industrial agriculture involved expensive machinery and chemical pesticides and fertilizers in pursuit of higher outputs and profits, while consumers’ relations with their food sources and nature became attenuated.