Over the weekend, tv news showed footage of British consumer activists, clad in white, raiding a farm, bobbies in pursuit, to destroy a genetically modified crop. That particular stunt backfired: the people-in-white destroyed the wrong crop. Genetically modified food is taking over from the 'green revolution' based on hybrid plant varieties, that got underway in the 1960s. Genetic modification modifies plants' DNA so that they need less water, less fertiliser or less pesticide. Like the technology of the 'green revolution', genetic modification has a vast potential. The reduced costs it brings mean that it will be incorporated in virtually all major crops---already it dominates the North American soy and maize plantings.