The ‘3-30-300 rule’ for urban nature exposes acute canopy deficits in 8 global cities

crossref(2024)

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摘要
Abstract The ’3-30-300 rule’ is a recently proposed metric which sets minimum standards for access to nature in cities for human wellbeing. It specifies homes, schools and workplaces should have a view of 3 trees, be located in a neighbourhood with over 30% tree canopy cover and be within 300m walk of a park. This metric is an important progression for assessing urban nature because it is easy to understand, highly local, and sets a pass/fail benchmark for green infrastructure. Using a global dataset of over 2.5 million buildings in eight cities, we show that most buildings fail the ’3-30-300’ rule due to inadequate tree canopy. The ‘3’ standard was met more often, while ‘300’ was patchy. Further analysis indicates that existing trees are too small for adequate canopy cover. Cities must invest in improving planting conditions to support tree growth and enhance governance to reduce premature removals and excessive pruning.
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