I am a published independent researcher into the science of adaptation and am currently researching a book "The Deep Doughnut Principle: How Compact Heterogeneity Determines Sustainable Growth and Adaptation, Across the Adaptation Sciences". The idea behind the book is to explain how the Doughnut principle works across various sciences in which sustainable adaptation is a key dynamic. We can learn from Nature how various types of organism and systems are able to sustainably manage their own resource boundaries while also being able to adapt and innovate. The principle underlying such regulation is a very deep one, in my opinion and the solutions adopted by Nature to achieve this are only just starting to be understood. Doughnut Economics may be the true economics of natural systems and by extension can show us how it can be the natural economic model for humanity.