柯南特说入侵物种是一个世界性的问题。

Conant said invasive species are a worldwide problem.

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但是，当他想象哈佛的未来时，柯南特就由不详之兆转向了坚定的信念。

But as he imagined Harvard's future, Conant shifted from foreboding to faith.

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希拉•柯南特：曾经会有某些鸟类给一些植物授粉，但是当这种鸟类灭绝后这些植物也变得越来越稀少。

Sheila Conant: We used to have birds that pollinated specific species of plants, and some of those plants have become very rare because their pollinators have become extinct.

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