Research examines urban green space access using a 3-30-300 rule; findings highlight disparities and suggest policy needs for healthier cities.
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A study published in Nature Communications examined whether 862 European cities meet the “3-30-300” principle: having a park within 300 meters, at least three visible trees from home, and an area where tree canopy covers at least 30% of the ground. The research, which promotes better urban greening for healthier cities, found that while 57% of European city dwellers live near a park and nearly half see at least three trees, only about 28% live in areas with sufficient canopy cover. North and Central European cities generally perform better than southern ones, partly due to climate differences. Only two major cities, Espoo (Finland) and Varese (Italy), have over half their population meeting all criteria. The article notes that while the principle is valuable for combating urban heat stress—as canopy cover alone can prevent a significant portion of heat-related deaths—it remains voluntary in European law. Some cities are taking proactive steps, such as Florence planning to plant 50,000 trees by 2030, and Paris focusing on creating water-permeable “oases.” The text also highlights that greening efforts can sometimes lead to gentrification, and suggests that long-term planning is crucial for success.
