Human eyes have evolved to detect subtle differences in green. And that's not a coincidence. A recent study used brainwave sensors and heart rate monitors to measure people's responses to urban greenery. Here's what they found: 🟢 Urban greening reduces heat stress. 🟢 Even artificial green walls improve mental wellbeing. 🟢 Simply seeing greenery has a positive effect on the brain. That's why the EU's Nature Restoration Law aims to protect existing green spaces and tree cover in cities by 2030, while expanding them over time.