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Another group of animals that effect extinctions indirectly are introduced species. Some species can move to other countries by ship. Sometimes, humans bring some species to other places consciously as pets and for other reasons. However, these species prey on some indigenous species. Therefore, they go extinct.
Another affect is from global warming. Global warming causes abnormal weather and to changes habitats. Some species cannot adapt to these change and then these species go extinct.

Finally, I will introduce how to prevent extinctions. The solution of this problem is to restrict and decrease factors of extinction. The concrete solution divide into two ways. One way is to restrict these factors by some international law. In fact, Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) was established by IUCN (Ministry of Economy, Trade and Industry, 2015). CITES restrict the trade of species. Another way is that individuals must have concerns about extinction. The solution of international issues such as this problem need very big changes. People in the world must have concern about extinction and prevent extinction for ourselves

In conclusion, a lot of extinction occurs in the world. It makes human life uncomfortable. Extinctions are caused by two factors. One type is direct such as environmental destruction and poaching. Another type is indirect such as introduced species and global warming. Moreover, the solution of this problem is restricted and decrease factors. We need to establish international laws and have concerns about extinction. One endangered species may have the potential of material of drug. When we prevent extinction, our life will be more comfortable.
 
Reference List
The illustrated book of endangered species, KONICA MINOLTA. (n.d.).
Retrieved July 13, 2015, from www.konicaminolta.jp/kids/animals/
Convention on International Trade in Endangered Species of Wild Fauna and Flora,
Ministry of Economy, Trade and Industry. (n.d.).Retrieved July 13, 2015, from
www.meti.go.jp/policy/external_economy/trade_control/boekikanri/cites/
Information of endangered species, Japan integrated Biodiversity information system. (n.d.).
Retrieved July 13, 2015 from www.biodic.go.jp/rdb/rdb_f.html
Red list of IUCN, Japan committee for IUCN. (n.d.).
Retrieved July 13, 2015, from www.iucn.jp/species/redlist.html

Summary