To understand the effect of ice melting (融化) around the world we first have to understand what an ice sheet actually is. Covering 5. 4 million square miles in Antarctica (南极洲) and 656, 000 square miles in Greenland, an ice sheet is actually a huge land of ice from the Ice Age. These sheets form in areas where snow that falls in winter does not melt entirely over the summer. This ice, home to different species of animals, is now melting at a rate that cannot support the life it currently holds.
Many of these creatures rely on ice sheets as land for resting, hunting and protection, yet as the size decreases, they are forced out of their homeland in search of other land on which to live. Often this means journeys to search for food and an imbalanced ecosystem happens when different species are forced together onto the coast.
Since the 1990s, the deer population has dropped by 56 percent— climate change has caused warmer temperatures over winter setting off rainfall instead of snow, which freezes more quickly underfoot and makes it harder to walk and search for food. In the summer, frozen layers of land melts and releases trapped diseases which bring death to animals. A similar situation has fallen on the polar bears who suffered a 40 per cent population loss between 2001 and 2010.
Quite apart from these problems, the threat of sea levels rising if the ice caps were to disappear is approaching. If the Greenland Ice Sheet melted, the sea level would rise around six meters, and if the Antarctic Ice Sheet melted, sea levels would rise by around 20 feet. As a matter of fact, sea levels have risen about eight inches since 1880, three of which were gained over the last 25 years. This seemingly small amount has already caused dangerous flooding, loss of farmland and more deadly storms.
While we’re still a long way from losing the ice sheets all together, we’ve already lost too much and if we don’t take climate change seriously now, we will certainly hit the point of no return.
【小题1】What is an ice sheet according to the passage?| A．It is an area where ice never melts in summer. |
| B．It is a land of ice that covers all Greenland. |
| C．It is a large area of ice that exists for centuries. |
| D．It is an ice world for animals to live on. |
| A．It makes it easier to travel to other land. |
| B．It increases the population of sea animals. |
| C．It makes their surroundings more comfortable. |
| D．It causes hunger and illness among animals. |
| A．Ice sheet will soon disappear from the Earth. |
| B．Sea levels are rising faster in recent years. |
| C．Greenland will be the first to lose all its ice. |
| D．All natural disasters happen due to sea level rise. |
| A．Effect of Melting Ice Sheets | B．Ice, Sea and Animals |
| C．Cause of Melting Ice Sheets | D．Changes of Sea Levels |
