Toepfer ensured the "thanks" weren't for trivial events such as a gift, but for genuine, meaningful events.

托普·菲尔确保这些“感谢”针对的不是如收到一件礼物的小恩小惠，而是真实的有意义的事件。

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"If you're looking to increase your well-being, take 15 minutes to write letters of gratitude to someone," said Toepfer, who published his study in the Journal of Happiness study.

托普·菲尔已经把他的这项研究发表在了《幸福感研究》上，他说：“如果你想增加幸福感，就花上15分钟写一份感谢信吧。”

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Toepfer is quoted as saying that recovery will take years and the situation must be monitored.

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"The battle for sustainable development, for delivering a more environmentally stable, just and healthier world, is going to be largely won and lost in our cities, " said Klaus Toepfer, Unep's executive director.

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"Climate change in polar regions is expected to be among the greatest of any region on the Earth, and it will cause major physical, ecological, sociological and economic impacts, " Dr Toepfer said.

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