Top Alpine skiers say glacier loss is threatening the future of their sport and the wider environment.
Lindsey Vonn and Mikaela Shiffrin said many training glaciers they once used have nearly disappeared.
Host nation Italy has lost more than 200 square kilometres of glacier area since the late 1950s.
Glaciers near Cortina, once visible from town, have shrunk to small ice patches.
Athletes now travel long distances to reach major ice fields such as the Marmolada.
That glacier has halved in 25 years and could mostly vanish by the 2030s without strong climate action.
Italian skier Federica Brignone said the retreat of ice worries her beyond sport.
She described glaciers climbing higher each year and called it a planetary concern.
Scientists report an accelerating decline in glacier volume and area.
Loss of ice threatens water supplies, increases mountain hazards and raises sea levels.
Globally, more than 6.5 trillion tonnes of ice has disappeared since 2000.
Many athletes say changing conditions already affect training.
Exposed rock, crevasses and flowing water now make some glaciers unusable.
They warn fewer locations will be able to host future Winter Olympics.
Researchers say limiting warming to 1.5°C could preserve about 100 Alpine glaciers.
Skiers argue rapid cuts in fossil fuel use are essential to protect winter sport and mountain ecosystems.
