Over hunting is perhaps the most obvious direct cause of extinction in animals, as it has affected several large and well-known species
[B].
Genetic diversity as represented by genetic differences between discrete populations with wild species, is liable to reduction as result of the same factors affecting species
[C].
A major, though at present largely unpredictable, change in natural environments is likely to occur within the next century as a result of large-scale changes in global climate and weather patterns
