In the chapters that follow, Singer goes on to apply these 'right to life' arguments to animals, embryos-fetuses and human beings. Therefore, some non-human animals share the special value placed on humans. Singer concedes that the 'right to life' argument is harder to apply to non-human animals that have no personal interest in continuing to live. However he points out that they are still conscious beings with interests. The corollary of Singer's argument is that the state of the environment is important because it affects humans.
Singer goes further and queries whether the environment has intrinsic value.
However he is forced to concede that this is a difficult question. However the reader is left with the impression that he will continue searching. The clarity and simplicity of Singer's arguments makes 'Practical Ethics ' a delightful read. This book offers much to people who dare to ask the difficult questions and who are insightful enough to look at the bigger picture. Practical Ethics ' is truly valuable.