We live in a time of ecological change. Climate change is occurring alongside other interrelated environmental transformations. We are amid the biggest disruption to Earth’s nitrogen cycle in two and a half billion years, and a mass extinction of species for the first time in sixty-six million years. When it comes to climate, the last time there was this much carbon dioxide in the atmosphere was three and a half million years ago. Change on a scale unprecedented in human history combined with our inability to stem these trends thus far contributes to a sense of being at a tipping point – that unless these challenges are addressed effectively and soon, human life will become irrevocably unpredictable and volatile.