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Sources

Figures on this site were checked against the sources below on 15 November 2026. Where those sources differ, both are shown and labelled.

• National Park Service, “Nature and Science - The Arctic”, tundra section (checked 15 November 2026)
• National Park Service, Rocky Mountain National Park, “Alpine Tundra Ecosystem” (checked 15 November 2026)
• National Park Service, Lake Clark National Park & Preserve, “Tundra” (checked 15 November 2026)
• National Park Service, National Natural Landmarks, “Tundra” (checked 15 November 2026)
• NOAA Arctic Report Card 2022, “Tundra Greenness” (checked 15 November 2026)