Video Ad Feedback Ice core scientist and high altitude mountaineer Alison Criscitiello has collected ice core samples from pole to pole, including from the summit of Mount Logan, Canada’s highest mountain, as part of the Rolex Perpetual Planet Initiative. 04:01 – Source: CNN Call to Earth 15 videos Predicting future climate change using ice cores Now playing Call to Earth: Forests of the Deep 23:43 Children from around the world unite to celebrate the planet 02:09 Meet the school children saving Britain’s eels 03:58 How Norway’s sheep herders are helping to conserve coastal heathlands 03:12 05:22 Reviving ancient practices to restore the environment 03:48 Santa Barbara’s Chumash people blend ancient wisdom with modern innovation 03:50 Call to Earth: Restoring the Andes 23:04 Protecting Mexico’s mountains 04:00 A nature-first approach to education 03:58 03:50 03:57 24:02