What is more, a white roof can cost as little as 15 percent more than its dark counterpart, depending on the materials used, while slashing electricity bills.

不仅如此，白色的屋顶除了能让电费帐单大大降低，相比于黑色的屋顶，它们的制造费用仅仅多出15个百分点，还要视具体使用的材料而定。

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The company claims that the coating cools traditional roofs by 50 to 80 percent in summer, and holds on to about 80 percent more warmth than a white roof in the winter.

公司声称这种涂料在夏天会比传统的屋顶凉爽50%到80%，而在冬天要比白色屋顶多容纳80%的热量。

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It is a question that echoes around the globe, but nowhere more urgently than across the vast swath of Asia that draws its water from the "roof of the world."

这个问题的回音在全球传响，但没有任何地方比这里更迫切需要解决方案，青藏高原这一“世界的屋脊”为大半个亚洲提供着水源。

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It was little more than a razor wire and mesh compound of cages, protected from the elements by a metal roof.

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But to our family, this modest brown cabin with its green trim and weathered, moss-covered roof is far more than just a summer vacation spot.

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The conversion took five years, and involved removing the roof, more than 10 feet thick, with a diamond saw, as well as extracting interior walls to make space for the art.

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