专家们一致认为在未来几十年内将出现一个难题：如何在不破坏地球的情况下养活90亿人口。
Experts agree that the next few decades will present a puzzle: how to feed nine billion people without wrecking the planet in the process.
只盯着上限，我们依然在破坏地球。
By focusing too much on the upper limits, we still risk harming Earth.
我们在破坏地球上的一切。
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