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Editor’s note: David Fleming’s former colleague Lawrence Woodward offers the following comment: Only four crops—corn (maize), oil seed rape (canola), soy bean and cotton engineered for herbicide and Bt tolerance—make up over 90% of the global GM acreage. Since David’s death a number of other crops have been developed which have not been commercially developed or widely grown despite great claims and widespread promotion. For a comprehensive review of GMO cropping, see John Fagan, Michael Antoniou and Claire Robinson, “GMO Myths and Truths” (second edition), Earth Open Source, 2014. See also www.gmeducation.org .