A city in Colombia lowered its temperature by 3.6°F after planting 2.5 million plants and 880,000 trees in green corridors, helping cool the streets and improve air quality. Fact check

The claim that a Colombian city lowered its temperature by 3.6°F (approximately 2°C) after planting millions of plants and hundreds of thousands of trees in green corridors is broadly supported by multiple sources, all referring to Medellín. While the exact numbers vary—some sources mention 880,000 trees and 2.5 million plants, others fewer trees or plants—the general consensus is that extensive urban greening projects have significantly cooled parts of the city by around 2°C and improved air quality. However, the precise figure of 3.6°F (2°C) temperature reduction is often described as "up to" or "in some zones," indicating localized effects rather than a uniform city-wide drop. The claim is consistent with Medellín’s known green corridor initiatives, but exact numbers and temperature reductions differ slightly across sources, reflecting natural variability and reporting differences.