Green Equilibrium: The vital balance of humans and nature - Hardcover

His book is an engaging mixture of ecologist's travelogue and science exposition, which manages to convey a wide range of important ideas in evolution and ecology in the context of ecosystems around the world (Brian Drayton, Biological Conservation)

Wills does an excellent job of exploring the interplay of environmental factors and human genetics over the course of history (CHOICE)

Field biologist and eminent academic Wills provides evidence aplenty, from decaying coral reefs to devastated Himalayan forests, to show just how far out of balance with nature we humans have become. (Northern Echo)

An encompassing work of fresh and realigning perspectives and discoveries enlivened by his wildlife photographs a uniquely honed and eye-opening history of human evolution (especially of the brain), migration, and adaptation. (Booklist)

This inspirational, clearly-written book leads us to fascinating places around the world and instructs us beautifully about the ways in which their natural systems function, challenging us to work towards global sustainability for our common benefit. (Peter H. Raven, President Emeritus, Missouri Botanical Garden, St. Louis)

Green Equilibrium is a richly enlightening exploration of the world and our place in it, infused with fresh insight from science and a deep concern about the future of our planet and our species. (Carl Zimmer, author of A Planet of Viruses and The Tangled Bank: An Introduction to Evolution)

In Green Equilibrium, Christopher Wills explains the rules by which ecosystems maintain a diversity of interdependent species, in particular the balance of predators and prey. Wills is both an eminent academic and a hugely experienced field-biologist. In presenting the concept of 'green equilibrium', he draws on a fascinating range of examples, including coral reefs off the densely populated Philippines, the isolated and densely forested valleys of Papua New Guinea, the changing Himalayan kingdom of Bhutan, and a Californian ranch being allowed to return to a wild state. In each case he assesses the impact of modern changes and attempts at conservation on these delicately balanced ecosystems.

Wills shows how human populations, too, are an integral part of the picture. We now know from genetic evidence that over the course of history, as humans spread out of Africa, populations adapted as a result of environmental conditions. Striking new evidence indicates that some human populations carry genes from past encounters with other hominids (Neanderthals and Denisovans), as well as genetic adaptations to local hazards such as malaria. Wills argues that the most effective approaches to conserving green equilibria come out of evolutionary insights, and from close involvement of the local communities who have lived and adapted to them.