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the degree of variation of life forms within a given species, ecosystem, biome, or an entire planet. In plants as in other organisms, greater biodiversity implies greater health. Genetic uniformity increases the potential for crop vulnerability to new pests and stresses. Germplasm conservation gives us the sustained ability to develop new plant cultivars than can resist these pests, diseases, and environmental stresses. Wild ancestors and relatives are the keys to genetic diversity.
"In calling for a stop to the destruction, it is the losses themselves that count, not a putative cliff that humans will fall off of somewhere down the road." G David Tilman