05/05/2026
https://www.facebook.com/share/p/1EFT41CYYg/
🌳 Urban trees cool cities – but not all trees, and not in the same way everywhere.
Increasingly urban planners are using trees as nature’s ultimate air conditioner. But to maximize their efficacy in combatting the urban heat island effect, three major factors must be considered:
🟢 Tree traits
🏙️ Urban form
🌡️ Climate conditions
📘 Published in Communications Earth & Environment, a new meta-analysis of 182 studies across 110 cities and 17 climate zones reveals a complex picture.
✅ In 83% of cases, tree planting brought peak monthly temperatures below 26 °C.
✅ In some areas, trees reduced pedestrian-level temperatures by up to 12 °C.
But which trees are used, where and how, makes a big difference:
🌍 In tropical, temperate, and continental climates, mixed evergreen and deciduous trees in open urban spaces offer ~0.5 °C more cooling than single-species setups.
🏜️ In arid climates, evergreen species outperform others, especially in compact urban areas.
🌬️ Nighttime cooling can be limited by tree crowns trapping longwave radiation, reducing efficacy after sunset.
⚠️ In some conditions, trees can actually trap heat instead of cooling things down – for example, when their leaves stop releasing moisture or when they block air from moving around.
📊 The researchers built an interactive map and database, linking tree traits and cooling performance by city type, as a tool to help planners benchmark their strategies with climate-smart data.
🌱 Trees aren’t just about cooling. They support SDGs across the board – from health (SDG 3) and climate action (SDG 13) to sustainable cities (SDG 11) and biodiversity (SDG 15).
💡As cities grow hotter, we need more science-based, context-specific guidance for greener, cooler urban futures.
Find the study here 👉 https://ow.ly/91LE50XLynq
