The Oxford dictionary defines extinction in relation to biology as a species, family or a large group having no living members (Oxford, 2016). With the estimation of the four billion species that evolved on earth during its 4 billion year existence, about 99% of them now are extinct (Novacek, 2001). This displays how natural extinction is, but it is usually stabilized by speciation (Barnosky, 2011). A major extinction event is one in which many species meet their end over a short period of time, these events are grand in scale and many species of all ecological types (i.e. animals and plants, aquatic and terrestrial) all around the world are involved (Benton, 2011).
However, rewind back 444 million years ago as I tell you a little bit about the first major extinction on Earth. Between the end of the Ordovician Period and the beginning of the Silurian Period, the oldest of the five extinctions took place. The Sam Noble Museum explained that the cause of this extinction was solely caused by climate change. Due to a southern hemisphere ice age, the climates cooled and took out many species. On the other hand, as the climates began to get warmer after the ice age, even more species were lost.
These gases mainly consist of water vapour, carbon dioxide and sulphur dioxide gas. • Carbon dioxide emitted would contribute to the Greenhouse effect and warming of the Earth. • Molten lava rolling down the mountain side may engulf entire towns in its path [ fig 3 ]. The towns at highest risk would be Bravo and Charlie Towns in Zones A and B. • Aerial Island’s entire source of agriculture is located within Zone A, with the highest risk of being destroyed by the eruption.
He died while trying to get closer to the Mount Vesuvius that was erupting. Pliny the Younger described the eruption in a letter. The explosion includes all the problems that can follow an eruption: debris, lava, landslides, pyroclastic flows (very hot gases and fragments of rocks that rush down, destroying all in its path), enormous plumes of ash and even lahars (slides of mud created because of rain or molten snow that can also destroy huge areas). One of these eruptions
Humans drastically altered the world’s environmental conditions throughout history. Since their evolution, global temperatures are the highest that they’ve ever been. As a result, species such as the baleen whale has evolved to survive in their changing environments to the best of their ability. However, as global temperatures rise, oceans will slowly revert to how they used to be before the ice ages, when baleen whales were smaller and had teeth (Townsville Bulletin). This poses a threat to their survival, they are going to have to continuously evolve –or perish like their ancestors.
Also, the lingering effects of nuclear war causes considerable amounts of lasting damage to the environment and society. Nuclear war causes devastation in many different forms, especially in the environment and society as is currently known. The first effects of nuclear war are seen in the destroyed environment. “Fires from even a limited nuclear war would throw enough soot into the atmosphere to block sunlight and lower global temperatures (MacDonald).” The initial impacts of atomic bombs would stirs up massive amounts of dirt, soot, and debris from the earth and launches it into the ozone, as well as the radiation that the bombs release. This increase of debris in the ozone would block sunlight, which would the cause drastic temperature changes to occur all over the world.
World wildlife stated that Humans and animals face new challenges for survival because of climate change. More frequent and intense drought, storms, heat waves, rising sea levels, melting glaciers and warming oceans can directly harm animals, destroy the places they live, and wreak havoc on people’s livelihoods and communities. (Source 5) . Meaning that the longer we let it climate change affect our planet the higher the chance of the increase in tides, hotter heat storms, and drought.In the next several decades, storm surges and high tides could combine with sea level rise and land subsidence to further increase flooding in many regions. According to Nasa, Sea levels continue to rise after 2100 because the oceans take a very long time to respond to warmer conditions at the Earth’s surface.
Approximately 250 million years ago, almost all life was eradicated from the surface of the Earth In a short moment of geological time, when our planet experienced what is now known as the Permian-Triassic Extinction, or The Great Dying. Scientists have deduced that this was a result of of a sudden spike in global average temperature, which led to various natural calamities across the globe. Based on past and current research being conducted on the subject, climate change is more of a threat to life on this planet than it ever has been before. Recent meteorological data collected suggests that temperatures around the world are rising at an increasing rate – considering how devastating the effects of the last mass extinction as a result of climate change were, it is not very difficult to predict the end this time around. Alternating precipitation patterns, changing ocean currents, melting icecaps, floods, droughts, tsunamis… every year we see more and more occurrences of each of these disasters, and still manage to refuse to acknowledge one of the biggest and scariest one of our problems as a significant threat.
This is a usual portion of evolution .But from time to time extinctions transpire at a far faster rate than usual. For example, at the conclude of the Cretaceous era 65 million years ago, a mass demise provoked the demise of countless disparate kinds of animals and plants, encompassing the dinosaurs .Dinosaur Nowadays human interference is additionally provoking quick extinction. It is this kind of demise, provoked by humans, which we deal
And the fossils they found suggest that there have been five mass extinction passed in the Earth’s history. And the most well-known mass extinction is the Cretaceous the tertiary mass extinction and this is resulted in the disappearance of the dinosaurs sixty-five million years ago. And if the extinction is part of natural event, why are we concerned about it now? Because the rate of extinction is higher that the natural rate that does not allow the ecosystem to recover or other species to occupy the vacant niches. And it is also because the primary cause of extinction is the human kind that is abusing the nature.