Por un escritor de hombre misterioso
The World’s Greenest Cities: Madrid, Spain
Madrid, naturally sustainable
MADride Travel
Sustainable buildings, the greenest European cities, SmartGreen Post
Europe Travel: 20 European Cities Ranked Best Green Capitals 2022
Green Madrid: 10 good reasons to visit it - Ecobnb
Madrid, the world's second city for green spaces
Ranked: Top 10 Greenest Cities Around The World, 2020 - CEOWORLD magazine
The “Top Ten” Greenest Cities in the World — STS
Urban parks, why are they so important? - Iberdrola
Madrid's Urban Ecology Innovations – Part I, Center for Leadership in Global Sustainability
The 15 Greenest Cities In The World Are Hitting Green Goals
Satellite Images Ranks Europe's Greenest (and Not so Green) Cities