Expert gives grim warning after Swiss glaciers shrink 20% in 5 years. Switzerland’s glaciers, which are disproportionately impacted by climate change, have lost nearly 20 per cent of their mass in five years, experts said on Thursday, with 2026 registering the second biggest melt on record. Swiss glaciers saw 5.5 per cent of their volume melt away this year, the Glacier Monitoring in Switzerland (GLAMOS) network found in a new study, published after a record.