Earth Faces a Sixth Mass Extinction

Scientists faced the sixth mass extinction of the Earth in the UK have studied the distribution of birds, butterflies, plants over the past 40 years, but the results of these studies indicate that the Earth is another mass extinction It indicates that it is moving in the direction. This extinction may come from this in human activity. During the 4 billion years the Earth had existed, it experienced the extinction of five large species. Recently, the most famous thing led to extinction of the dinosaur, which occurred 65 million years ago.

Given the life that might accompany mass extinction, we can look back. In the history of the earth there were five extinct species extinct - colleagues and I proposed the sixth extinction recently - and compare the current rate of change with the "Big Five" extinct geological record And this warning sign is true. This case is widely said to be due to the Siberian trap - the impact of the volcanic eruption of lava and related greenhouse gas emissions currently occurring in northern Russia. This caused global warming, acidification of the ocean, acid rain, depletion of marine oxygen, and intoxication of toxic metals such as mercury. Please imagine the darkest climate forecast today.

The fact that the Earth's biota enters into the sixth "extinction of mass" depends on a clear proof that the current extinction rate is much higher than the "background" rate during the past five mass extinctions It has been repeatedly claimed. Estimates of previous extinction rates were criticized using assumptions that might overestimate the seriousness of extinction crisis. We use superconservative assumptions to evaluate whether human activity leads to mass extinction. First, we used two extinction ratios per 100 species of mammals (ie 2 E / MSY), recently estimated for 100 years, which is twice the previously widely used estimate. Next, compare this ratio with the current mammalian and vertebrate extinction rate. The latter is conservatively low, because the classification of species as extinction needs to meet stringent criteria.

We are on the verge of the sixth mass extinction on the planet. Harvard biologist E. O. Wilson estimates that 30,000 species (or 3 species per hour) are extinct every year. Compare this to the natural background rate of extinction per million species per year. You can see why scientists call it a crisis that is not aligned in human history. Current extinction of material is different from extinction of all other species in that it is caused by a single species rather than the physical process of the planet and galaxy. Homo sapiens sapiens - moved from Africa to Middle East 90,000 years ago, moved to Europe and Australia 40,000 years ago, moved to North America 12,500 years ago and moved to the Caribbean region 8000 years ago. It is a wave of extinction. Colonization - The subsequent pattern of extinction is seen as colonization of Madagascar human beings 2000 years ago, and it quickly expels elephant birds, extinct hippos and large lemurs.