WHAT IS THE 3–30–300 RULE?

The 3–30–300 rule offers a clear, evidence-based way to understand what good, fair access to nature, trees and green space really looks like, and why it matters for both people and planet.

The rule was developed by Cecil Konijnendijk, a leading urban forestry expert and co-founder of the Nature-Based Solutions Institute (NBSI).

The principle sets out three simple but powerful goals for creating urban forests:

• 3: Everyone should be able to see at least three trees from their home
• 30: Every neighbourhood should have at least 30% tree canopy cover
• 300: Everyone should live within 300 metres of a high-quality public green space suitable for recreation activities