Words: 2021
For example, China has more than 200 million automobiles and as a speed of growth is about 13 million per year, meanwhile the United States has about 255 millions automobiles and the growth speed is more than 10 million per year. So, we can see how large pressure forced on the earth. It is clear that the globalization causes the climate change. Global Warming continues presenting on the earth and bringing many catastrophes to the earth. The polar bears most scientists think they are the first species in the world influenced by the climate change. Since the earth becoming warmer and warmer, the sea ice shrunk violently.
As a result, the polar bear was threatened by those changes. More important hint is that if the situation still exists, polar bears will extinct in the future. This paper is focusing on the effect of the Global Warming on the polar bears’ ha bait, behaviors and population. Effect on Habitat The first effect of the Global Warming on the polar bears is their habitat. Habitat is the place providing animals with food, sleeping area and every essential material to live. In the Arctic, the polar bears’ habitat becomes worse recently due to the shortage of sea ice and food.
The first change in habitat is increasing the temperature of the Arctic. With the Global Warming, polar Bears 3 enrapture increasing, the sea ice over here melts quickly. Finally, this should transfer to the polar bears and lead they die out. David barber, an instructor of the University of Manitoba working for Earth Observation Science, indicated that a medial temperature of the Arctic rose 3. 5 degrees from 1970 to 2000, meanwhile the whole world only rose 0. 7 degrees (Campbell, 2008). The temperature of Arctic increased more extremely compare with the other parts.
This means under the global warming, we may not know that the earth becomes hotter and hotter and realize it is a serious problem because we cannot feel it. However, the deep change is going on in the Arctic. The first victim is the polar bear. Furthermore, if the sea ice disappears, the temperature of the Arctic will go up extremely. Louis Fortier, a scientist of a study group of Canada named Arctic, said that the Arctic sea ice cover has existed for about 3. 7 million years and it works as a huge mirror to reflex the sun lights back into space.
The vanishing of the ice cover might lead to a higher speed of global warming tendency (Campbell, 2008). This means that the two factors of polar bears’ habitat which are the temperature and the sea ice affect each other. The temperature directly determines the total amount of the sea ice. On the other hand, when the sea ice is shrinking, more and more lights cannot be reflected to the space. As a result, the temperature rises again. The second change in habitat is the sea ice which covers the Arctic Ocean. Because of global warming, the sea ice has diminished. A huge change happened on 2007. Near 1. Million square km of Arctic ice disappeared in that year beyond far away from formal yearly medial of 70 thousands (Campbell, 2008). This huge change led more people worry about global warming and thus the polar bears lost their habitat. At this point, we will consider Global Warming, Polar Bears 4 about if the Arctic sea ice is gone in the future. Sea ice cover Of the Arctic decreased at the average of 1 1. 5 percent every ten years during the summer melt season from 1979 to 2010. Lots of scholars hold the opinion that the Arctic sea ice cover will completely melted around 2050 (Swift, 201 1).
Through this research, we can imagine that the sea ice decreased quickly in recent couple decades and the serious coming effect. The last change in habitats is the food. Under the climate change, polar bears’ food sound cannot survive in the melting sea ice. Polar beads main food is seal, but global warming disturbs this food chain, so polar bear is hard to find their food. Due to the increasing melting on ice, there is less place leaving to all the polar bears as well as his primary food seals. Both must live on the sea ice. Because food is limited, polar bear need find other choice (Cole, 2009).
The longer summer melt season will destroy the entire Arctic food chain, especially causing the most serious effect to Polar bears (McGrath, 2011 The melt season will influence polar bears to search food. The longer melting season the more risk will happen on the polar bears. With the sea ice shrinking, the seal and polar bear both declined. Without enough food supply, polar bears are hard to survive from the cold place. For those reasons, the sea ice becomes to smaller and smaller, and the temperature over the Arctic is increasing to higher and higher and the food web is disturbed, there is few places leaving for the beautiful polar bears.
Due to the Global Warming, the temperature of the Arctic is increasing critically and then this intensifies the melting of sea ice. As a result, there are no place to live and no food for polar bears. Global Warming, Polar Bears 5 Effect on Behavior The other effect of the Global Warming on polar bears is change in their behaviors. Behavior means that some kinds of things the polar bears do every day or some certain time, such as swimming, eating, mating. First, the change happened on food searching of polar bears.
Generally, the prime food for polar bears is seal. But under the climate change, it is difficult to find seals around the Arctic. To survive, polar bears need to find foods no matter how hard to get it. This is the first way the polar bears change their searching food methods. Scientists indicate the result of global warming in the Arctic. Since the food chain has been disturbed, many polar bears which cannot find food in their habitat run out of the Arctic to the human societies, such as Norris, Alaska and Churchill, Manitoba.
Those polar bears walk around the trash dropped by human to find something to eat (Cole, 2009). Trash is very unclean and harmful foods for the polar bear, but in order to live they must eat. Trash contains a lot of germs and viruses everyone should know that. Therefore, if the polar bears eat it often, it is clear that their health will get bad. This is the second way of finding food. Under the difficult times when the polar bears hard to find seals, they try to find optional foods. Even if they will die, they may swim for long distance that they never have done before (Cole, 2009).
This way is very dangerous because the polar bear don’t realize how long the way should be, many of them died. Even through polar bears swim very well, far swimming in the ocean will cause exhausted even deadly to them. For instance, A young polar bear that tracked by the scientists had swum a shocking Global Warming, Polar Bears 6 distance with 427 miles to get the ice nearby the northern Alaska beach in 008, but the cub died finally (Mcgrath, 2011 Without food supply, the pathetic polar bears have no choice. They must face the long moving trip even involve death.
This is the third way of finding food. Behavior scientists think that young polar bears will be eaten by the hungry males which even eat their mothers will appear often due to the food chain disturbed (McGrath, 201 1). Everyone can imagine how cruel it is. Scientists hold the opinion that the food shortage results polar bears eat each other. In the history, polar bears might eat each other, but not happening often like these current years http://www. polarbearsinternational. Org). This result is caused by the climate change. Due to the climate change, polar bears are struggling in the food shortage.
Sometimes, if they could not find a food in a long time, they might eat their cubs. The second change in polar bears is mating. Mating is the processes of having cubs and feeding them to grow up. During the global warming, polar bears can’t get their main foods to supply their bodies, so no enough blubber storing their bodies, the females might give up the processes of pregnancy and feeding their children (Owen, 2010). With the lack of ice season become longer and longer, polar bears cannot get sufficient blubbers in their bodies. O it will make pregnancy and feeding cubs more difficult for polar bears (Cole, 2009). The both authors mention the challenges caused by the foods shortage. So the point is here, to get enough foods is an essential thing of mating. For example, An Ontario Ministry of Natural Resources research scientist, Martyr Aboard works with polar bears in the southern Hudson Bay region. His study indicates that polar bears’ body weight has fallen to 80 percent of Global Warming, Polar Bears 7 original weight and the weaker males can’t have energy babies through the cue rent 20 years (Campbell, 2008).
Those aspects show the effect of global warming affect the polar bears’ behaviors. With the climate change, the polar bear must change their behaviors to adapt the new environment. However the most changes that the polar bears have done are dangerous and harmful to themselves. As a result of the behavior changes on the polar bears’ population is decreasing. Population is the total number of polar bears. Currently, the population of the polar bears is estimated from twenty thousands to twenty- eve thousands bears by biologists. Most of those live in Canada ((http:// www. polarbearsinternational. Org).
With the decline of the sea ice, polar bears’ population also drops down at the same time. Most scientists accepted a possible trend in polar bear population, which Was decreasing between twenty percents to twenty eight percents in 2007 within the 25 years ago (Helm, 2008). This is a research done by scientists. Canada’s Hudson Bay called the polar bear capital of the world only had three quarters of the polar bears’ population compared with 25 years ahead (Cole, 2009). Through the cording and scientists’ studies, we can know that the declining of polar bear population already became a serious issue.
Moreover, the U. S. Geological Survey reported that if greenhouse gas emissions continue strongly presenting only one-thirds or less of the polar bears through the world could be alive, in 2007 (White, 2011 The climate change not only affects polar bears behaviors but also influences their mating activities. As a result, the population of polar bears goes down. Because the Global Warming changes their habitat deeply, the polar bears must change their former search food ethos at first Second, their habitat changing also Global Warming, Polar Bears 8 influences polar bears’ mating abilities.
So far, the population of polar bears has dropped down. As has been shown in the previous discussion, Global Warming affects polar bears’ habitat, behaviors and population. Since the temperature of the world increases dramatically, the sea ice over the Arctic region decreases quickly. As a result, the polar bears loss their habitat and food. For finding food, polar bears swim very far distance beyond their abilities, so lots of they may drown in the sea. To response the climate change, polar bears changed their rotational methods of searching food and their mating abilities.
Polar bears may swim a very far distance to find food or even eat their cubs. At the food shortage times, they cannot feed their cubs very well. As a result, a lot of cubs died in this process. As the climate change, the total number of polar bears decreased fast. If this trend does not change in the following years, polar bears will extinct. However, if we change our living ways in order to controlling the emission from industries, power plants and automobiles and so on, there is still opportunity for us to protect polar bears even to protect ourselves.