Why Calgary trees are turning yellow - and how you can help

[news]

http://i.cbc.ca/1.3680747.1468595606!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_460/yellow-trees-calgary.jpg It’s the height of summer, but the city’s poplar, elm and ash trees are starting to show their fall colours. A Calgary forester says it’s a reaction to a dry winter and spring.


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