the biodiversity shrinks as well.

生物多样性也减少了
Is this a concern?

这是否需要担心呢
Well again, if we think about Iowa,

正如我们所说以爱荷华州为例
92% of the farm acres in Iowa are corn or soybeans,

爱荷华州92%的地种的都是玉米或大豆
and so Iowa which is an incredibly fertile part of the country,

所以在爱荷华州这么一个土壤肥沃的地区
you have to import a lot of the food

许多食品仍然
that's actually eaten in Iowa,

需要从别处进口
because it's basically the raw stuff that's grown,

因为这里基本只种了玉米和大豆之类的
the corn and the soybeans, and shipped elsewhere.

原料然后出口
Let's talk about orange juice.

我们来谈一谈橙汁
There was a graduate student at Yale

耶鲁的森林和环境学院
in The School of Forestry and Environmental Sciences

有一位名叫梅丽莎·汉密尔顿的