Dr Heïdi Sevestre is one of the world's leading voices on the need to protect our planet's cold places and the damage being caused by climate change. In this episode, Heïdi and Noel discuss her recent expeditions to the Arctic, Greenland and Andes, surviving severe storms and polar bear encounters, and joining the world's best climbers to help carry out research in extreme locations. Heïdi and Noel also discuss the importance of science communication and the need for climate scientists to raise their voices.