Blue and green algae in the clear water of the Grassi Lakes, near Canmore, Alberta, Canada
Blue and green algae in the clear water of the Grassi Lakes, near Canmore, Alberta, Canada (© Gaertner/Alamy)
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Blue and green algae in the clear water of the Grassi Lakes, near Canmore, Alberta, Canada (© Gaertner/Alamy)
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