归根到底，气候变化是一个全球性挑战，只有通过全球合作才能解决。

All in all, climate change is a global challenge, which can only be resolved through global cooperation.

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拯救野生老虎是一个全球性的挑战。

Saving the wild tiger is a global challenge.

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这些贸易谈判是对能否在气候变化问题上达成全球性协议的挑战的一个关键考验。

These trade talks are a critical test for the challenge of striking a global deal on climate change.

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