Global Warming
supper是什么意思Task One: Greenhou Effect
The “greenhou effect” is a widely ud phra the days. We all know that it means the general phenomenon of rising temperatures.Today, our world is hotter than it has been for 2000 years. By the end of the century, if current trend continues, the global temperature will be likely to climb higher than at any time in the past 2 Million years.
Firstly we will investigate in detail global warming caud by the greenhou effect. But before we start, let me fill you in on some basics concerning the greenhou effect.
Solar radiation interacts with the surface of the Earth in veral ways. Some portion of this energy is reflected back into space by the earth atmosphere. Another portion is disperd and scattered by the molecules in the atmosphere and a large portion penetrates the atmosphere to reach the surface of the earth. The radiation reaching the Earth surface is largely absorbed resulting in surface warming. As they leave the earth, and once again interact with the atmosphere. Some of the reradiated energy escapes into space but most of it is reflected back to the earth surface by molecules in the earth atmosphere. This phenomenon is similar to the warming and cursing of a car that
ascentis parked outside on the sunny day. The molecules responsible for this phenomenon are called green hou gas. In esnce, green hou gas act like an insulator or blanket above the earth keeping the heat in. Increasingly concentration of the gas increas atmosphere’s ability t o grow or escape the infrared radiation. In other words, the earth’s insulator gas get thicker. That is what we called the “greenhou effect”.
Task Two: Climate Change
An environmental studies professor at Stanford University says, “(Quote) There’s no w ay. There’s anything natural that can explain it.” A professor of atmospheric sciences at MIT says, it’s part of the natural warming and cooling a planet goes through. Well, they’re talking about transitions in the earth’s temperature, something Carl Azuz now boils down to the basics.
(Carl Azuz)
In a world that’s always changing,there’s one thing that ma ny folks want to stay the same: the temperature. A change of just a couple degrees, can make a world of difference, and not necessarily a good one. The Ea rth’s average temperature fluctuates, going through both warming and cooling periods. The last cooling off period was between 1945 and 1975.Since then, though, things have be
en steadily heating up. And most
scientists point to Arctic ice melting as proof; something Anderson Cooper saw firsthand.
(Anderson Cooper)
Already in the last 30 years, at least 400,000 square miles of a ice has melted. That’s about the size of Texas and California combined. And as the ice melts it affects a levels around the world, which impacts tens of millions of people.
(Azuz)
What’s controversial about climate change is whether peop le have anything to do with it. A change in the Earth’s orbit or the sun’s radiation could cau global warming.But so could an increa in greenhou gas.The Earth needs the gas to maintain a warm, livable environment. But they contain carbon dioxide, which has incread dramatically over the last couple centuries. This may be due to car emissions, burning fossil fuels, deforestation. Many scientists blame all of it for causing the world to warm up. But is it all just theory, another planetary “summer” before “fall”,or are we headed for vere drought, consuming fires and melted ice caps?
i am a studentTask Three: Cracks in the Ice
(Carl Azuz)
billgatesHi, I’m Ca rl Azuz. However you are watching this edition of
步步高英语学习机CNN Student News, we’re glad you are. Thanks for tuning in this Thursday.
(Azuz)
First up, we’re heading south to Antarctica, where it’s cold, but apparently not cold enough. A huge chunk of ice broke away from the continent this week, and some scientists are blaming it. on the changing climate. Now, since Antarctica is south of the equator, summer just ended down there. So, this is the time when major events like this are most likely to happen. Emily Chang has more details now on the icy breakup.
(Emily Chang)
Scientists fly over a giant chunk of Antarctic ice as it cracks and collaps. The chunk is enormous, about 7 times the size of Manhattan, 160 square miles. It was part of the Wilkins ice shelf, the biggest on Antarctica yet, scientists say, to fall victim to global warming.
童心未泯英文>中国高中排名(David V aughn, British Antarctic Survey)
Watching Wilkins ice shelf disappear at the moment, we learn a lot more about how ice responds to climate change.
(Chang)
The ice is just a small fraction of the Antarctic ice sheet, but it broke off well before scientists predicted, a sign they say that
climate change might be happening faster than expected. One expert told us last year.
offer的用法>betrayal
(Lonnie Thompson, Glaciologist)
I think what we do know is that ice is probably the best nsor of the large scale changes taking place. And in many ways, I think we’re in uncharted territory.
(Chang)
Ice plays a vital role in cooling the Earth’s temperature and regulating a levels. As it’s lost,the planet gets warmer, a levels ri and more ice is threatened. A vicious environmental circle!
soon是什么意思By the end of the century, many experts project a levels will ri between 7 and 23 inches, and temperatures could increa by up to 7 degrees Fahrenheit. But some say tho estimates are too conrvative.
(James Hann, NASA Climate Scientist)
There are glaciologists now who are getting very worried. But they haven’t really come out and said what they think. (Chang)
This part of the Antarctic is warming about five times faster than the rest of the world. Six other ice shelves have been lost entirely, and scientists say the Wilkins shelf could be next.
