Why are many species facing extinction?

As we all know, there are numerous kinds of species facing extinction. Looking into the reasons, I have to admit that the natural environment have influenced their selection to some degree; however, the main reason is humans’ destruction.
Firstly, humans are changing the Earth every second; therefore, the animals’ habitats are altered all the time. If the changes of the natural environment occur in a slow speed, there will not be any impact on the species. However, in contrast, there is not enough time for species to adjust themselves to the new environment if the changes occur in a very fast speed. The pollution of the sea animals’ habitats and the change of the global climate apparently demonstrate that humans’ activities have already destroyed every region of the world, especially in the past several decades. Besides, the exotic species destroy the balance of the native ecosystem. During the lengthy period of time, the native species like plants and animals have already become a part of the specific landscape. They are well adapted to their local environment and are accustomed to other native species. However, after humans bringing exotic species to the area, the balance of the ecosystem will be disrupted and may lead to other serious consequences at the same time. Moreover, humans’ overexploitation also contributes to the extinction of species. With the development of the society, humans spare no effort to satisfy themselves such as eating shark fin. Because of its delicious taste, people cruelly capture these species. And the rising of the market demands directly leads to the continuous suffering of exploitation.
To sum up, many species face the extinction because of humans’ activities. We really should do something to protect them. It is urgent for us to realize that protecting the species in the world is making contribution to ourselves and our later generations.