"In 2015 and 2016, we reached the peak for air pollution," says Paula Palacio, who was Medellin's local infrastructure ... as "green barriers" against this dangerous particulate matter, absorbing ...

a poverty-stricken and drug-infested city that was considered the most dangerous in the world. Medellin, Colombia’s second-largest city, was home to an internationally feared drug cartel and ...

Medellín's green corridors have been lauded for their cooling and environmental benefits. How well is the project working and what can other cities learn from it? Moisés Castro has worked ...