When Wilson Cheung took Hong Kong secondary school students into the Swiss Alps this summer, terrain he had once been able to reach had become inaccessible. Glacier melt and thawing ground had destabilised parts of the mountain, while rockfall made fieldwork more hazardous. Only weeks earlier, Cheung had completed a roughly 1,700km (1,056-mile) scientific snowkite traverse across Greenland in 2026. The journey took him across the ice sheet while he continued collecting data in one of the world’s...