ElsevierWorld Water Day, held on March 22, is an annual United Nations Observance focusing on the importance of fresh water. The theme of this year’s observance is Glacier Preservation; glaciers are critical to life – their meltwater is essential for drinking water, agriculture, industry, clean energy production, and healthy ecosystems. To mark World Water Day 2025, Elsevier has curated a free special collection of journal articles and book chapters to raise awareness for this important topic, and to help advance #SDG6 research.