If you want to have an idea what is happening with Biodiversity decline (or not), this is a good point to start. They present the case of amphibian group and how it is threaten by different factors, as well as the implications of loosing this taxonomic group. In the end, the authors try to bring the idea that Ecological Ethics, is a new field that should consider moral dilemmas like what to protect or not, when to intervene or not, and so on. Recommended for anybody interested in the topic, as it doesn't have a very technical language.