Madrid Unveils "Plan Sol" to Expand Urban Vertical Forests

The Madrid City Council has launched "Plan Sol" today, a multi-million euro initiative to transform the capital's architectural landscape through the installation of vertical forests on public buildings. The project aims to combat the "heat island" effect that has plagued Madrid during recent record-breaking summers by using native plant species to naturally lower ambient temperatures by up to 3 degrees Celsius. The first phase will focus on the government buildings surrounding the Puerta del Sol, turning the historic center into a green lung for the city. Environmentalists have praised the initiative, though some urban planners warn that the maintenance of such large-scale biological installations will require significant water resources. In response, the council has integrated an advanced gray-water recycling system into the project, ensuring that the vertical forests are sustained through reclaimed water rather than the city’s drinking supply. This move is part of Madrid's broader strategy to become the greenest capital in Southern Europe by 2030, balancing historical preservation with radical ecological modernization.