A Nebraska Cornhusker frets as he surveys his drought-stunted crop. A Nigerian yam farmer digs up shrunken tubers. A Costa Rican coffee baron lays off hundreds of workers because a fungus has spoiled his harvest. I planted cherry trees in upstate New York last spring. One summer morning, they were denuded by Japanese beetles.

Such disasters are increasingly common on a planet buffeted by climate change and worldwide commerce, where heat burns crops, soil has been ruined by over-farming and drought, and bugs ride across oceans to feast on defenseless plants. Agronomists have been working on these problems for years, but the rapid population growth of humans makes overcoming these challenges increasingly urgent. If we can’t feed the world, it will eventually feed on us.

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