How Climate Benefits from Trees Scale with Cities

Trees influence meteorological and climatic effects at all scales of a city, from pocket parks to entire neighborhoods. However, while research has been done on the effect of trees canopies on urban environments, in general, we are only now beginning to understand how urban canopies affect climate at all scales of the city – from an individual building to a street, park, overall pattern of land use and finally, the city as a whole. Back in 1978, G.W. Grey and F.J. Denke stated in Urban Forestry that most cities were forests. This statement surprised many people. However, the definition of a forest is that “at least 10% of the land is stocked with trees” (Rowntree 1984). A typical North American city may have a commercial core with less than 10 percent tree cover, but immediately adjacent areas usually show greatly increased cover, with residential areas often in the 15 per...

Full article: http://www.sustainablecitiescollective.com/deeproot/12714...

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