30 percent of the Arctic is switching from carbon sink to carbon source. But could future fertilizer be made deep underground using less resources? Also, how and perhaps why globally 2024 had the highest number of fatal landslides in over 20 years, and an unexpected sound from space prompts a re-evaluation of how the earth’s magnetic field interacts with the environment around it.Presenter: Roland Pease Producer: Alex Mansfield Production Coordinator: Jana Bennett-Holesworth(Photo: Magnificent icebergs. Credit: MB Photography/ Getty Images)