Cecil Konijnendijk has been studying, teaching, and advising on urban forestry for more than 25 years. He is interested in how trees can improve our cities, communities, personal lives, and mental health. Cecil came up with a rule he calls 3-30-300 which has become popular among climate change activists and urban tree canopy specialists. The rule encourages seeing at least 3 trees from your window, having 30% canopy coverage in your neighborhood, and having a high quality public green space within 300 meters (340 yards) from your house. 

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