As glaciers retreat or disappear because of climate change, the Canadian Rockies' iconic turquoise-coloured lakes will be lost.
Lake Annette, left, and Lake Louise in Banff National Park. As glaciers retreat, the melt is changing lake colour across the Canadian Rockies, in some cases, from milky turquoise to sapphire blue.
The lakes get their iconic colour from rock flour, which is similar in appearance to baker's flour used for making bread. Rock flour is made from glaciers grinding rocks into powder, which can take thousands of years. But as glaciers retreat or disappear with climate change, less flour is produced, resulting in clearer lakes.
"There's a lot of unique biodiversity in these glacially fed Alpine lakes and streams that will get lost," Vinebrooke said.,"It [colour change] might not be a good thing for those particular species," said Janet Fischer, a biology professor at Franklin and Marshall College in Pennsylvania.
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