These are the causes of the extinction of animals.
1) genetics and demographic phenomena
2) genetic pollution
3) habitat degradation
4) predation, competition and disease
6) climate change
A number of organizations, such as the Worldwide Fund for Nature, have been created with the goal of preserving species from extinction. Governments have attempted, through enacting laws, to avoid habitat destruction, agricultural over-harvesting and pollution. Ongoing technological advances have encouraged the hypothesis that by using DNA from the remains of an extinct species, through the process of cloning, the species may be "brought back to life".