According to Indian crop ecologist Vandana Shiva, humans have eaten some 80,000 plant species in our history. After recent precipitous changes, three-quarters of all human food now comes from just eight species, with the field quickly narrowing down to genetically modified corn, soy, and canola. If woodpeckers and pandas enjoy celebrity status on the endangered-species list (dubious though such fame may be), food crops are the forgotten commoners. We're losing them as fast as we're losing rain forests. An enormous factor in this loss has been the new idea of plant varieties as patentable properties, rather than God's gifts to humanity or whatever the arrangement was previously felt to be, for all of prior history.