Regarding to extinction of many animals especially that are in danger, many individuals think that people have to take care of herbivores because this approach might led to increasing chance of forage among excited animals and human have higher level of ratio for surviving as result of extinction of carnivorous and wild animals that stay in same stage with human at food supply, though this path has some crucial issues such as food cycle needs all creatures and destroy wildlife has a myriad unpredictable effects on world. In my perspective, our obligation is that we must maintain our world without any bias.
On the one hand, a lot of animals are in risk of extinction, so a part of society believe that we need to save just animals are useful for us due to some facts. First of all, with decreasing the number of animals there is a little food and nutrition for other animals that they survive as result, they can find forage more easily and all source of energy spend on useful animals. Secondly, there is a rival in each stage of food cycle as consequence, if carnivorous and wild animals are extincted, human can derive nutrition more comfortable than before.
On the other hand, base on this information that says a tremendous number of animals are in situation that may die all of them, a theory is published about saving only useful animals for us. There are various unplanned issues behind that such as food cycle needs all creatures and destroy wildlife has a myriad unpredictable effects on world. To elaborate this problems I have to say, our lives depend on environment so we have to protect it in order to increasing the chance of survival and if we chose some animals that realize useful for us, it can causes various unpredictable effects for our life, for instance, the BBC news reported decreasing the number of cats in Londen city may cause not only increasing mouses but also rising disease amount people that was not predictable until it was happening.
In conclusion, many animals are in danger of extinction. Some people say only animals that are useful to humans should be protected because sufficient source of food is available and reducing rival between human and other wild animals, though it has some negative sequence like, destroy food cycle and unpredictable result of this approach. I firmly believe that we have to save our world without any restriction or selective approach.