reserve in the north of england. just outside the city of york is askham bog, created by a retreating glacier 15,000 years ago. it is brimming with biodiversity. that's the name for all living things and how they fit together. but the uk is one of the most nature—depleted countries in the world. a new report says thatjust 53% of our biodiversity is left. that is compared to the global average of 75%. that matters because biodiversity affects the air we breathe, the water we drink, and the food we eat. biodiversity is more than something that is beautiful to look at and that we love. it is also what provides us with so many of our basic needs. it is the foundation of our society. we have seen recently how disruptive it can be when supply chains break down.