Switzerland's iconic mountains are truly one of the wonders of the world, famous for their dramatic snow-capped peaks. But the Swiss Alps are under threat, and in turn putting centuries old villages below them in grave danger. The Alps are warming at twice the global average, placing them on Europe's frontline of climate change. Dozens of towns have been damaged, and one completely destroyed in catastrophic landslides. Foreign Correspondent travels through the Alps and up the glaciers with reporter Naomi Selvaratnam to see the problem first hand. The growing danger and mounting costs are producing climate refugees in one of the richest nations on earth. The question now for Swiss authorities is who gets to stay in the mountains, and at what cost.