The 30 Cleanest Cities in the World
El Hierro, Spain
Technically, El Hierro is not a city as it is one of the Canary Islands (that belong to Spain), but it attracted the whole world’s attention earlier this year as it managed to produce enough electricity for its 7,000 inhabitants for more than 24 hours by its hydro-wind plants only. Known for its lush ancient forests and volcanic cliffs, the island is a UNESCO biosphere reserve.
