The Extinction of the Polar Bear What Greenhouse gases are, how they work, and why they are threatening the very existence of the polar bear. “If a warming world melts nearly all sea ice during summers, as computer models predict will happen by the end of the century, scientists warn that the polar bear is unlikely to survive as a species.” Jordan Sherry 05-30-06 The Problem Carbon dioxide is what’s know as a “greenhouse gas” meaning it is able to keep the Earth warm by trapping some of the heat it produces within the Earth’s atmosphere. But if too much of the gas is trapped in the atmosphere it can get too hot, and according to scientists that is what is happening now. Starting during Industrial Revolution to concentration of carbon dioxide has increased by nearly 35 percent, which is more than the Earth has experienced in more than 650,000 years and more than the natural variability would allow. This in turn has cause the average temperature over the past century to raise about 1 degree, and another 4 degree increase is expected during the 21st century.
The Cambrian Period is the first period of the paleozia period. It is characterized by the appearance of a wide tange of complex, fossilizable multicellular organisms, meaning that it was around this time, that fossils have been indentified from this time. A wide range of species emerged from this period including trilbotes, brachiopods, arthropods and conodonts. Mass extinction ended the Cambrian period. Advancing glaciers would have lowered the temperature of the shallow seas therefore such big changes in temperature would alter the amount of oxygen in the water and meant the end for any species that couldn’t adapt.
One theory hypothesis is that the climate became too wet while another that the climate dried out to kill off the dinosaurs. The dinosaurs could have starved to death or died from the over-heating. Scientists continue to add new causes for the extinction of the dinosaurs. Some of the recent mechanisms are: 1) cancer trigged by huge bursts of neutrinos released by dying stars in the Milky Way Galaxy. 2) AIDS.
It would change our climate, but it would not bring us close to the level of uninhabitable Venus. A doubling in CO2 levels would make agriculture much more difficult due to shifts in climate that occur as a result of increasing temperature. CO2 can indeed cause a significant degree of warming if it is suddenly released into the atmosphere, as we have been doing for the past 150 years. Aside from that, increasing temperature can also cause the rising of sea level as the glaciers are going to melt at a faster rate like never before. Next, is the change in environmental health.
Since the temperatures have started to rise, the ice that they once lived on has melted and they are having a very difficult time surviving. People have increased the temperature of the Earth by contributing their pollution. Burning fossil fuels and forests has been the biggest issue amongst us all. Simple changes could help in simple ways but the fact is that since it is a global issue, the world has to be involved in order to make a difference. The United Nations has contributed in this way by holding meetings to discuss the climate changes throughout the world and what can be done to help.
Many animals in Antarctica are dependent on ice, but as temperatures increase and ice melts, their populations decrease. There are many ice-loving penguins that are predicted to either drop dramatically in population or even go extinct, but this will allowed for open-water penguin populations to increase. To conclude, the environment of Antarctica is dependent on how the temperature changes, but no matter what, it will change with the temperature and changes will
During this season they mate in the sea and give birth on land or ice floes. Changes in the climate are affecting them just as they are affecting other species in the arctic. Global warming may seem more realistic for a mammal living in the north than it does to humans living in urban regions. Some of the coldest spots on Earth have warmed up and continue to warm up which is resulting in centuries old ice caps melting, rivers running dry, and coasts eroding and as a result, threatening communities[1]. Winters are shortening and sea ice is diminishing at a rate of about 3% per decade.
The people who dies after they enter the tomb wasn’t from the curse it was from natural causes. The second theory, states that because the tomb was hundreds of years old, and because the dead in those days were buried with an assortment of food, numerous potentially toxic molds and bacteria were present in the tomb. When disturbed, the theory goes; these different toxins can cause numerous complications, especially if inhaled in large quantities (Handwerk, 2005). Two of these toxins, Aspergillus niger rand Aspergillus flavus, the theory adds, can be very harmful to people whose immune systems are not strong enough to withstand the
In environmentalist Bill McKibben’s 2008 article, “Civilization Last Chance,” we are warned that we are in a state of emergency time we have little to save our environment from the danger. The current status of our earth is in danger, and people don’t seem to realize the serious consequence for the future. Robert W. Christopherson’s textbook, Geosystems, is an introduction to physical geography with scientific evidence. The current edition of Geosystems introduces the consensus science regarding human-created climate change. The high content of carbon causes global warming and global warming causes climate change.
The deglaciation of ice sheets and glaciers, which happens when we enter a interglacial warming period, are important because they have an immense impact on the land structure and vegetation throughout our continent, as well as the rest of the world. The deglaciation of the Wisconsin Glacier caused the formation of the Great Lakes as well as Niagara Falls in New York. This melting of ice sheets also causes sea levels to rise which covers landforms. The water submerges bridges and passageways between continents that were used by animals which migrated from continent to continent. This prevents certain species of mammals and plants from returning back to their native land, which drastically changes the vegetation and habitat of certain areas.