Is global warming real? Why global warming exist?
Isreal? Some of us me ask such question. Ask the white bears of Churchill, Canada. bears hunts from floating sheets of ice in Arctic seas. On the southwest shore of Hudson Bay, the big fee comes just before the winter ends, when adults bears eat 150 pounds of seal meat a day. They gorge themselves,fattening their bodies until up in spring. Then the animals must live until November freeze on energy they have stored. Since 1950,However, the ice has been forming later and breaking u earlier.
The amount of ice in Hudson Bay is about one-third less that it was then, making the bears feeding season nearly a month shorter. That’s because the average localhas gone up 4.5 celcius. Okay, Don’t ask the bears, ask the scientist. There is no longer any debate about whether global warming is real or not. The arguments are over what is causing it and whether we should or can be doing something about it. Ten of the 15 warmest years of the 20th century occured after 1985 . The average global temperature rose 10 celcius over the last century,and it’s expected to rise another another 1.4-5.8 celcius during hundred yers. In the polar regions, the increase may be 10 celcius or more. The ice shelf is shrinking. Glaciers are melting from Alaska to Africa, from Peru to China. Sea level has riseb from 10 to 20 centimeters since 1900. It expected to rise about abother.6 meters along the United States costs by 2100. As air warms, increases. Soil becomes drier in some places, and precipitation increases in others. Landscapes change from tundra to forest from grassland to desert.
Averge global temperatures fluctuate naturally over time but the current change mat also have human causes. Certain gases in the atmosphere trap heat. They are called greenhouse gases, as they have a warming effect like a green. They include carbon dioxide and nitrous oxide. Industry, farming, and the burning of coal and hydrocarbons have added to the level of greenhouse gases. Since the industrial age began, the level of carbon dioxide in the atmosphere has increased by 30 . It is expected to rise another 30 to 150 percent by 2100.
Long before then, the polar bears will be gone from Churchill. By 2030, The ice-free season will be three months longer that it is now. The bears will have to migrate north to survive. Elsewhere arount the Globe, animals plant life will have to adapt toin order to survive.
hat about us? how about the human life? Science cannpt predict what the long term effect of global warming might be. But it’s certain that we don’t want to find ourselves in the same situation as those polar bears.
here is the global temperature changes(1880-2010
Read more: http://scienceray.com/earth-sciences/getting-hotter/#ixzz1C6KRVUb2