How a Colombian city cooled dramatically in just three years

A vertical garden at Medellin’s City Hall. Photo: Peter Yeung

Peter Yeung-13 May 2024

With “green corridors” that mimic the natural forest, Medellín is driving down temperatures — and could become five degrees cooler over the next few decades.

It’s mid-afternoon along Medellín’s Avenida Oriental, a traffic-clogged road that scythes through the heart of the second-largest Colombian city. Nicolas Pineda is crouched on his haunches as cars zoom by on both sides…