但是上万种旧品种和野生亲缘则随着土地利用的改变，全球变暖以及随机因素自生自灭。
But hundreds of thousands of older varieties and wild relatives are left to the vagaries of land-use change, global warming and chance.
例如，对植物而言，栽培品种的新特性可能会偶然转移到其野生亲缘品种中去。
With plants, for instance, there is always the possibility that new traits could be accidentally transferred to wild relatives of domestic species.
作物的野生亲缘可以更好地适应严厉的气候条件，但是收集和繁殖这种作物的努力才刚刚开始。
Wild relatives of crops could be better suited to harsher climes, but efforts to collect and breed such crops are just beginning.
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