(Goldenberg, Suzanne.) The bears at risk are a sign of something wrong in the Arctic marine ecosystem. Climate change and the lost of sea ice habitat is the greatest threat. They now have fewer opportunities to feed. They rely on sea ice to hunt and store energy for summer and fall, when food can be scarce.
The biggest threat to polar bears is global temperatures rising. They rely on sea ice to catch prey, to migrate, to procreate, and to rest. They are currently endangered and scientists have discovered that if global temperatures do not decrease, polar bears will go extinct. Due to these rising temperatures, polar bears are struggling to cope with these new changes in their environment because they are so ice-dependent. Scientists are trying to save the last of the ice because this is how they hunt for seals.
One other contending argument is that since Isle Royale is a natural habitat, we should leave the island alone and let it run its course, even though the wolves might die out. This proposal would be inefficient and would only make matters worse. Wolves are the main predators of the many moose who occupy the island. If the wolves die out, the moose will thrive and overpopulate. Eventually, the extremely large population of moose could use up all of their available natural resources, causing the island to become vegetationless and the moose to starve and die because of the lack of resources.
There are an estimated 600,000 black bears in North America, 300,000 in the United States. A bear's litter is usually 1-6 cubs, but a litter of 2 cubs is the most common. One commonly known thing about bears is that they hibernate. Hibernating means that they spend the winter in a certain place. Before a bear goes into hibernation they collect enough food to last them the winter, and they make a shelter that will protect themselves from all the hardships of winter.
One third of the worlds soil bound carbon is in taiga and tundra areas and specifically 14% of earth’s carbon is in permafrost. Global warming is contributing to the melting of the permafrost and it is melting at an extraordinary speed thus releasing carbon dioxide into our ever so delicate planets atmosphere. The arctic tundra that withholds mass amounts of permafrost used to be a carbon sink, which safely homes carbon from the atmosphere but with global warming it is now a carbon
Richard Cyriax, author of Sir John Franklin’s Last Arctic Expedition, noted, “The loss of the expedition probably added much more geographical knowledge than its successful return would have done.” (Richard Cyriax, 2013) Much of Franklin’s failure and the deaths of his crewmates can be attributed to starvation, cold and scurvy. The Arctic is located at the top of the Northern Hemisphere. This part of the Earth is slightly pointed away from the sun, leading to the cold temperature. Additionally, the warm Norwegian Ocean Current decreases in temperature as it nears the North Pole. This cools the Arctic water even more.
Two types of feedbacks that have substantial effects on climate change are the melting of permafrost and water vapor feedback. Both of these feedbacks are considered to be positive feedbacks, which implies that they amplify warming. Permafrost is permanently frozen soil that stores massive amounts of carbon. Permafrost occurs mostly in high latitudes, and comprises of approximately 24% of the land in the Northern Hemisphere. As temperatures increases as the result of climate change, permafrost, which is made up of dead organic plant matter frozen into the soil that has yet to decay, is at risk of melting and releasing the stored carbon (that is hundreds to thousands of years old) as carbon dioxide and methane (which are powerful greenhouse gases).
The opening scene shows the collapse of a massive ice shelf (a floating glacier) in Antarctica. Could this really happen? If so, how might it affect global sea levels? The collapse of massive ice shelves have become more common with the changes in climate.
The article, Climate change and forest fires synergistically drive widespread melt events of the Greenland Ice Sheet, spoke about the different effects on the ice when the climate changed or there was a forest fire. The article, Concentrations and mass size distributions of particulate trace elements at summit, Greenland: Impact of boreal forest fires, included facts on the different chemical elements “affected by emissions from boreal forest fires” (Maenhaut, Hillamo, Mäkelä, Jaffrezo, Bergin and Davidson,1997, pg. S565) The article, High northern latitude forest fires and vegetation emissions over the last millennium inferred from the chemistry of a central Greenland ice
In contrast, it would be dangerous to break. The global warming could melt and they could get the water easier. If the Inuit people broke it, they would not survive. This is significant to the Inuit people. To sum up, global warming is significant to the Inuit people by the glacier melting and give them the fresh water
In both of these articles by Christine Dell’Amore and Matt Miller, they discuss how these top predators impact the island, why they are they important, and should humans interfere? On the island of Isle Royale, there is a variety of animals that mostly just consume vegetation; therefore, they need wolves to balance out the food chain. But, the island is only accessible during the winter when stable ice bridges are created. Unfortunately, the ice bridges have not been forming due to warmer winters. Leaving a small count of wolves on the island with no new genes to mix in.
According to the explanation, the author proposes that it is the melting of sea ice caused by global warming that results in the decline of the number of Arctic deer. However, unless she offers further additional evidence to strengthen her argument, the conclusion can remain, at best, unwarranted. To begin with, although some local hunters report that the deer population seems to be decreasing, it doesn’t necessarily mean that deer are really less than before. Clearly, the author assumes that the report by hunters is reliable. However, it is highly possible that hunters don’t tell the truth.