Forests give us shade, quiet and one of the harder challenges in the fight against climate change.

森林为我们提供了阴凉、宁静的环境并带给我们对抗气候变化的一个更艰巨的挑战。

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Organic agriculture is a relatively untapped resource for feeding the Earth's population, especially in the face of climate change and other global challenges.

有机农业是一种相对而言尚未开发的资源，可以用来养活地球上的人口，尤其是在应对气候变化和其他全球性挑战的情况下。

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This might be a small change to the way we view work and the office, but the researchers argue that it challenges a widespread characteristics of the economy: work is organized by clock time.

这可能会稍稍改变我们对工作和办公室的看法，但研究人员认为，这是对现今经济的一个普遍特征——按时钟时间组织工作——的挑战。

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member nations to assume their share of responsibility for dealing with global challenges including climate change and non proliferation.

VOA: standard.2009.09.23

"Time is up," "Over the next two weeks, governments have to deliver a strong and long-term response to the challenges of climate change."

VOA: standard.2009.12.06

"President Obama embodies the new spirit of dialogue and engagement on the world's biggest problems: climate change, nuclear disarmament and a wide range of peace and security challenges,".

VOA: standard.2009.10.09

Tchen candidly touched on a handful of personal life lessons to encourage patience and persistence when faced with the challenges of change.

WHITEHOUSE: Tina Tchen Delivers Commencement Address at Knox College

Kudos, too, for Kim Jong Il, who has shown unexpected political courage in accepting the challenges of change, not to mention a masterful sense of timing.

CNN: Editorial: Korea's Triumph

Discoveries in chemistry can help us rise to the challenges of climate change and develop alternative sources of energy.

UNESCO: Message by UNESCO Director-General Irina Bokova