In the United States or other western countries, are there any state or national regulation on the minimum/Maximum level of greenness or tree canopy coverage for the urban/suburban community (or other types of land uses)?
Same short answer from an European perspective: no nation-wide threshold value for urban tree cover that I’m aware of.
In France, (i) the general relevance of trees in the city and (ii) the accessibility to green spaces in large urban areas are both usually acknowledged. But much of the current institutional activity is centered on the identification and the preservation of ‘green infrastructures’: so a more-or-less multiscale ‘network’ planning logic instead of hard ‘percent cover’ targets.
It doesn’t mean that there is no bottom-up support for this perspective. For the US case, you might be interested by this paper. It says 38.91% of a sample of 329 large (pop > 5000 inh.) US cities had adopted “an urban tree canopy cover goal”in 2010.
Regards,
http://works.bepress.com/rachel_krause/5/
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