Thirty-four million years ago, East Antarctica crossed into permanent glaciation while the rest of the planet remained far warmer — a puzzle that has long resisted simple explanation. A 2026 study now reveals that the slow, silent work of mantle uplift, set in motion by Gondwana's Jurassic breakup over 100 million years prior, gradually raised East Antarctica into a high plateau where snow could endure, seeding the conditions that falling CO₂ would eventually ignite into a continental ice sheet. The discovery reminds us that the great turning points of Earth's climate are rarely the product of