Pikas' rocky habitat — found across various mountain ranges in Canada and the U.S. but exclusively above the treeline — is expected to slowly be lost as the climate warms and forests expand to higher elevations.

Source: https://www.cbc.ca/news/canada/british-columbia/pika-indicator-species-monitoring-1.6964581?cmp=rss

The Department of Forest and Park Services (DoFPS) conducted the study, which shows how the country’s treeline has experienced a substantial elevation change over the years.

Source: https://kuenselonline.com/impact-of-climate-change-on-bhutans-treeline/

There's a growing gap in the treeline outside Grande Prairie.

Source: https://www.cbc.ca/news/canada/edmonton/how-thinning-out-trees-for-dirt-grass-and-shrubs-is-part-of-fighting-wildfires-1.6862144?cmp=rss