作为回应，她的方案不仅帮助人们了解他们的炭足迹，而且注意到心理学和情感在人们行为改变中起到的关键性作用。

In response, her approach helps people understand their carbon footprints and recognizes the key role that psychology and emotion play in behavior change.

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世行在推进这一议程方面会发挥关键性作用。

And the Bank will play a critical role in taking this important agenda forward.

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最后，与往常一样，运气和时机又一次起了关键性作用。

Finally, as always, luck and timing have played a key role.

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