Essay On Species Extinction

There are time periods in the history of life on Earth during which exceptionally large numbers of species gone extinct. These extinctions are quite different from the rate of extinction, which occurs even when the diversity of life is increasing. Many species vanished from many ways of mass extinctions and today, almost of all species that have existed on Earth are extinct. Many species extinction risk studies require an accounting of both local and global threats. It is challenging to develop methods to make scientifically sound and unfailing extinction risk duties of species for which is little known. “Between a third to a half of land animal and plant species will face extermination” (Bhattacharya, 2004). The rapid loss of species seen today is estimated by experts to be between thousand and ten thousand times higher than the natural extinction rate. These experts calculate that between 0.01 and 0.1% of all species will become extinct each year. If the low estimate of the number of species out there is true it means that there are around 2 million different species on our planet then that means between two hundred and two thousand extinctions occur every year. But if the upper estimate of species numbers is true it also means that there are a hundred million different species co-existing with us on our planet and between ten thousand and hundred thousand species are becoming extinct each year. Most of our species are considered endangered in our environment through many causes that are leading them towards extinction such as disease, climate and ocean change, and human activity.

First of all, recent strides have been made to quantify the role of infectious disease in species extinction. “Globally, however, infectious...

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...tists concluded that ocean warming and acidification are the two greatest global threats that leads species to extinction. Human activity is the third reason that leads them into fatal and death of species. Human activity was involved in the past five great mass extinctions and they were related directly or indirectly. The directly of human activity that leads to extinction are habitat change, destruction, overexploitation of species, the spread of aggressive species and genes, pollution and climate change as humans use mainly all the earths lands for construction and they get advantage on fresh water rivers and limit natural rivers and unfortunate that drives species into massive fatal. While humans’ burn fossil fuels, the carbon dioxide have risen to their highest levels all over these years and that leads to global warming, rising sea levels and climate change.