Throughout history numerous species of animals and plants have faced with danger of extinction. While some of them were able to deal with this serious issue, the others could not resist and died out such as dinosaurs, mammoths and etc. Two main factors causing this problem are natural disaster and human being.
Firstly, the extinction danger is not only caused by humanity but also caused by natural diseases such as earth quakes, forest fire, lack of rain, extreme cold and high temperature (?). Most species need certain weather conditions to survive, if they cannot find suitable conditions, death becomes inevitable consequence. For instance, there was ice age on the earth thousands of years ago. According to the studies %90 of all species on earth disappeared at that time. However, in todays, wildfire would be one of the most dangerous way, because animals and plants living in that forest will be deprived of habitat even if they succeed to survive.
Second of all, there are some activities made by people which may endanger species such as hunting, air pollution, and destruction of habitats and so on. Valuable parts of the animals are the main reason for their being hunted. Generally elephants are hunted for their ivory, rhinos for their horns, deer and goats for their meats. Actually, balanced hunting may not cause for animals extinction; but, overhunting put animals' generation into danger (?). In addition, with the increase of the human population, need to place to settle increased, too. Then, people started to destroy species' habitats so as to create new settlement. In such a case, those plants and animals living in that habitat will no longer survive. Last but not least, air pollution is the another reason for being extinct. As a well-known a lot of organisms need fresh air to live. As long as human being keeps polluting air with carbondioxyde emission, those organisms will no longer survive.
To cut a long story short, both human being and natural diseases cause for species' being extinct. There is an undeniable fact that there is nothing to do about natural diseases; however, stopping some human activities can be the way to reduce amount of extinction.