It is clear that the dwarf wheat varieties of today are not the same as those fifty years ago. The Broadbalk Wheat Experiment2 documented the change in nutritional content over the last half century. Even as grain yields skyrocketed during the Green Revolution, the micronutrient content plummeted. Today’s wheat is simply not as nutritious as in

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The Haber–Bosch process is the most important chemical discovery of the twentieth century. By doubling the amount of disposable nitrogen, it provoked the demographic explosion that took the human population from 1.6 to 7 billion in fewer than one hundred years. Today, nearly fifty per cent of the nitrogen atoms in our bodies are artificially

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