Amid rain and snow, the Summit on the Summit team—working to raise public awareness of the global freshwater crisis—has reached its final encampment before trekking to the top of Kilimanjaro. Anticipation has some team members excited, while thin air and the arduousness of the climb has made others ill. Those who can will rise in…

National Geographic Emerging Explorers Alexandra Cousteau and Jimmy Chin are climbing Mt. Kilimanjaro in Tanzania with Jessica Biel, Emile Hirsch, Lupe Fiasco, Isabel Lucas, and other celebrities to raise public awareness of the shortage of clean water across much of the planet. Ohio State glaciologist Lonnie Thompson predicts that Kilimanjaro’s legendary crown of ice could…