Why is the Earth habitable? | Philip Pogge von Strandmann

The Earth is over 4 billion years old, but land animals have only existed on our planet for the past 500 million years. Why didn't animal life on land emerge sooner? And why did it emerge at all? The Earth scientist Philip Pogge von Strandmann has the answers. | Read along while listening at our Medium: bit.ly/2kzO0V6 | Narrated by Vidish Athavale | Music by Alasdair Cooper and Lee Rosevere | Philip is a Senior Lecturer in the Earth Science Department at UCL. His main research area is the Earth’s present and past biogeochemical cycles, including the carbon and oxygen cycles and what controls them. He is the 2016 winner of the Max Hey Medal.