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Due to climate changes, Arctic ice is breaking up earlier in the spring, and its area is decreasing. This is creating problems for polar bears that make their homes off northern Alaska and in Hudson Bay.
Polar bears off Alaska normally hunt and raise their young on ice sheets that float on the ocean. But as the ice has melted, the polar bears have been forced to spend more time on land. There, they have begun to frequent beaches, feeding on the remains of whales caught by native hunters. For polar bears, this food is less nutritious than seals that they normally catch on ice sheets. The shrinking(减少) ice has also forced more polar bears into the ocean. In the past, they only had to swim short distances between ice sheets. But as the ice has shrunk, polar bears have been forced to swim longer and longer distances in the open ocean. This poses a severe danger during rough weather, and an increasing number of drowned polar bears have been observed.
In Hudson Bay, the ice breaks up three weeks earlier in the spring now than it did 20 years ago. Polar bears in Hudson Bay fast(禁食) during the summer, waiting for ice to form in the fall to hunt. Every year, the summer gets longer, and the bears get skinnier. Over the past 25 years, the average weight of the female bears has dropped to 68 kg. This loss affects their ability to reproduce, and already the number of births has dropped by 15 percent. Unless the bears can learn to survive these climate changes, these giants of the ice may one day disappear.
Reforestation
Around the world there is an increase in the demand for reforestation. This is because the consumption of the forests has affected not only the animals living in the area but also the people. And reforestation is about the rebuilding of the forests that have been severely destroyed. It can offer a lot of benefits when the recreation is successful.
This includes collecting seedlings(幼苗) that are native in the area to make sure that there is natural reconstruction of the area. Some additional trees which are not native in the area also need to be planted.
The importance of having multiple species of trees is considered to make sure that the needs of other species that will live and grow in the area are met.
Destroying a forest is easy but rebuilding it is really hard.
The plan must include accurate spacing between plants. This is to ensure that they won't cover each other while they grow.
The forest greatly helps with the reduction of the air pollution. Trees are responsible for the production of oxygen and absorption of carbon dioxide. It is there for a reason just like everyone else on this planet.
There cannot be a better way to restore the balance of nature than to increase the forest area. We must remember that the forest is a natural habitat for a wide variety of animals and plants. In this manner, there is no substitute for reforestation.
A. And global warming will speed up the destruction of forests. B. Keep in mind that you can't just plant the seedlings anywhere. C. Recreations won't work until all these details have been considered. D. So a good plan is needed to make the reforestation a successful one. E. The forest also protects us from typhoons and other natural disasters. F. There are many things to be done when it comes to this type of effort. G. It is important to make sure that they are suited to the climate and the type of soil. |
