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"In its relationship with human beings, the plant kingdom has always locked itself closely into our virtues and our vices. There is therefore no reason to believe that future developments in the interaction between man and plants will be all beneficent.

Man’s future with plants, like the past, will be filled with contradictions and threats. Plants, whether from rainforest, steppe, back yard or the hands of genetic engineers, will continue to produce commodities we have never dreamed of, new trade routes, new wealth and, no doubt, great dangers too."

• David Cameron, Dangerous …