Regina — Wascana, sk

Elm trees are common in residential neighborhoods, but Dutch elm disease has threatened Regina’s elm population as the only known way to halt the spread of the fungus is to cut down the infected trees.

The city’s annual commuter challenge promotes walking, cycling, and taking the bus to reduce carbon dioxide emissions. Regina placed third in the country in 2016. That helped to avoid over 4,150 kg of emissions.

City of Regina bylaws require the installation of backflow prevention devices to prevent the contamination of water, a requirement that has been in place since 1992 to prevent cross-contamination of the water supply.