The reasons for concern are clear. 

The loss of mature trees in Ottawa’s residential neighbourhoods, and failure to replace them, has reached a crisis situation due to the intensity and rapid pace of infill housing, urban development and climate change. City policies, by-laws, internal procedures and enforcement practices intended to regulate tree removal and encourage tree replacement have not kept up. The result is a significant degradation of the urban environment that affects human health and hamper's the municipality's ability to adapt to the effects of climate change.

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This video by Ecohealth Ontario describes the connections between human health and trees.