Besides, the sensitivity degree of combined trait to environmental index was analyzed.

此外还分析了各品种综合性状对环境指数的敏感程度和稳定性表现。

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"Beijing Rose Garden" to stay away from urban pollution, the air fresh and unusual, often the environmental index remained at two under.

“北京玫瑰园”远离都市污染，空气异常清新，环保指数常处保持在二级以下。

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The index assessed sustainability in 112 cities by looking at 18 environmental indicators — from air pollution to waste recycling to mass transit — for the years 2004-2008.

该指数通过观察2004-2008年的18项环境指标评估112座城市的可持续性，这些指标包括空气污染、污水回收利用、公共交通等。

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Oman is ranked 110 out of 132 nations surveyed in environmental sustainability over the past decade, according to Yale University's 2012 Environmental Performance Index.

CNN: STORY HIGHLIGHTS

Not surprisingly, the countries are wealthy and among the world's greenest as well, according to the Environmental Performance Index, a joint product of Columbia University and Yale University, which measures performance against 25 indicators, such as measures of air pollution, water supply or use of natural resources.

FORBES: The Most Energy-Efficient Countries

Seasonal, environmental and demand-side factors have combined to accelerate the index's decline in recent months and could tip it further into the red.

WSJ: Global Shipping Faces More Choppy Waters