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MedellÃn’s Green Corridors Are a Breath of Fresh‚ Cool Air
It’s mid-afternoon along MedellÃn’s Avenida Oriental‚ a traffic-clogged road that scythes through the heart of the second largest Colombian city‚ and Nicolas Pineda is crouched down on his haunches as cars zoom by on both sides.
Wrapped up in heavy duty workwear and armed with a machete‚ Pineda is weeding a thick strip of tree-lined greenery running between the lanes. He hacks at a patch of dead‚ browning bush and then pulls up a rogue‚ zig zag-shaped shrub beside his foot.
“Es bien bonita‚” grins the 54-year-old‚ evidently pleased with his handiwork. “It’s very clean. That’s what I like to see: a clean‚ green city.”
Citizen gardeners at work. Credit: Peter Yeung
Pineda has helped to sow and maintain hundreds of thousands of trees and plants across MedellÃn as part of a people-led scheme to fight back against extreme heat through a network of “Green Corridors” across the city.
In the face of a rapidly heating planet‚ the City of Eternal Spring — nicknamed so thanks to its year-round temperate climate — has found a way to keep its cool.
Previously‚ MedellÃn had undergone years of rapid urban expansion‚ which led to a severe urban heat island effect — raising temperatures in the city to significantly higher than in the surrounding suburban and rural areas. Roads and other concrete infrastructure absorb and maintain the sun’s heat for much longer than green infrastructure.
“MedellÃn grew at the expense of green spaces and vegetation‚” says Pilar Vargas‚ a forest engineer working for City Hall. “We built and built and built. There wasn’t a lot of thought about the impact on the climate. It became obvious that had to change.”
Tree engineer Pilar Vargas inspecting a flower. Credit: Peter Yeung
Efforts began in 2016 under MedellÃn’s then mayor‚ Federico Gutiérrez (who‚ after completing one term in 2019‚ was re-elected at the end of 2023). The city launched a new approach to its urban development — one that focused on people and plants.
The $16.3 million initiative led to the creation of 30 Green Corridors along the city’s roads and waterways‚ improving or producing more than 70 hectares of green space‚ which includes 20 kilometers of shaded routes with cycle lanes and pedestrian paths.
These plant and tree-filled spaces — which connect all sorts of green areas such as the curb strips‚ squares‚ parks‚ vertical gardens‚ sidewalks‚ and even some of the seven hills that surround the city — produce fresh‚ cooling air in the face of urban heat. The corridors are also designed to mimic a natural forest with levels of low‚ medium and high plants‚ including native and tropical plants‚ bamboo grasses and palm trees.