Mass extinction events will take place that will erase all animals living on Earth, the fate of dinosaurs is a prime example. Currently, humans are in the early stages of the latest mass extinction.
The Ordovician-Silurian extinction (440 to 450 million years ago) was the first “great extinction” that occurred about 450 million years ago. It is considered the second largest extinction in history if measured by the number of species destroyed with 85% of fish species and 60% of biological species destroyed. 
The most accepted cause of extinction is a gamma-ray burst of a near-Earth star that caused a sharp drop in atmospheric carbon dioxide. This created an ice age that lasted 0.5 – 1.5 million years. Lower sea levels combined with the cold of glacial ice brought about a mass extinction in the Ordovician period. 
Late Devonian Extinction: Over 365 million years ago, one of the five largest and most feared mass extinctions in Earth’s biological history. It happened about 360 million years ago, killing 70% of all living things. 
Archaeological evidence indicates that this mass extinction could last up to 20 million years. Although it is one of the scariest mass extinctions in the world, its cause is still an unsolved mystery. 
Permian-Triassic extinction: about 253 million years ago is likened to the bloodiest massacre in Earth’s history. This terrible extinction event wiped out 95% of all species on earth. 
The main reason is due to the extremely strong tectonic movement of the Earth’s crust. Magma eruptions from fault plates engulfed the entire Earth’s surface in a sea of fire. The increase in dust and carbon dioxide causes the greenhouse effect to warm the Earth. Changes in ocean currents cause great impacts on the ecosystem, ocean circulation becomes stagnant, lack of oxygen. Life now becomes extremely fragile. 
Triassic-Jurassic Extinction: About 201 million years ago was an extinction that took place about 199.6 million years ago that completely wiped out half of all living things on Earth. 
It is still not certain what caused the disaster. Scientists predict that a large volcanic eruption has occurred. However, studies have shown quite accurately the time when the extinction took place and the meteor impact that created Lake Manicouagan (Canada). This evidence proves that it is possible that the collision was the direct cause of this extinction. 
The Cretaceous – Paleogene extinction occurred about 66.5 million years ago, marking the end of the Mesozoic and the beginning of the Cenozoic with the Paleogene period. About 75% of species went extinct after this terrible event. 
Scientists theorize that this extinction event was caused by one or more simultaneous disasters, such as the powerful impact of meteorites (creating the Chicxulub craters in Mexico, Boltysh in Ukraine). or due to a drop in sea level, powerful volcanic eruptions creating the phenomenon of “Deccan traps” that seriously destroy the Earth’s biosphere. 
Currently, humans are in the early stages of the latest mass extinction, which is happening much faster than any other species. Since 1970, vertebrate populations have decreased by an average of 68% and now more than 35,000 species are considered endangered. In the 20th century alone, as many as 543 species of terrestrial vertebrates became extinct. 
Since the beginning of the industrial revolution in 1760, humans have been a major factor in Earth’s current environmental crisis. From greenhouse gas emissions and ozone depletion to deforestation, plastic waste and the illegal animal trade, humans have been proactively depriving the world of some species and threatening many others. Please watch the video: Strange and Unique Natural Phenomena in the World. Source: Strange story VN&TG
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