The book is divided into three sections: we start with discussions of efforts to protect endangered species; move to approaches for protecting intact, functioning natural ecosystems; and finish with proposals to protect the global natural system (the biosphere). It becomes clear as one progresses through these sections that these three approaches do not constitute distinctly different, much less competing, strategies for protecting biological diversity. Instead they are interdependent. Efforts to protect a particular endangered species typically lead to efforts to protect its ecosystem. Similarly, efforts to protect an ecosystem lead naturally to concerns about the atmosphere, climate and water supplies. The interdependence may also work in the other direction: loss of species potentially can undermine the stability and resilience of ecosystems, which can have a large negative impact on the biosphere. The main conclusion is that a wide range of approaches to conservation is needed to maintain diverse and ecologically functioning natural systems.
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