Life on planet Earth flourishes as result of a perfect balance of a whole array of factors. Over the course of five episodes, David Attenborough shows how the forces of nature allows for humans to walk the Earth, animals to adapt to the most severe of environments, and how fauna thrives around the world. But this is a delicate system, one that is precious and sensitive to the slightest of changes. A slight tip of the scale and the planet is at risk of becoming imbalanced, resulting in devastating outcomes.