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nginx/1.14.0 (Ubuntu) Fresh air, clear water, pristine surroundings — it's what every green-minded tourist dreams of. But how can you know for sure whether your potential holiday destination is kind to Mother Nature? Check out the Environmental Sustainability Index ( www.yale.edu/esi ) compiled by environmental experts at Yale and Columbia universities.

The 2005 ESI ranks 146 countries based on 76 measures, such as forest cover and vehicle usage, and is grouped into 21 environmental indicators, such as biodiversity and air quality. This year, Finland and Norway rank first and second, respectively: "They've put a great deal...