Just 50 years ago, some 1,000 small and family-owned seed companies were producing and distributing seeds in the United States; by 2009, there were fewer than 100. Thanks to a series of mergers and acquisitions over the last few years, four multinational agrochemical firms now control over 60 percent of global seed sales

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Full potential in progress. Joanna Mackenzie with our Global Food Ethics Project takes a closer look at promise and challenges of PPB

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