동영상강좌
  CF로 배우는영어
  생활속표현
  영어뉴스
  오디오*비디오 수업
  오늘의 동영상
  강사가 들려주는 금주의 명언
홈 > 커뮤니티 > 오늘의 동영상   
 
What If All The Clouds Disappeared Forever?
관리자 2021-03-03 오후 12:56:34 1220

 

Description: 

Clouds cover about 70% of the planet at any moment. But what if — poof — 

they all disappeared? While hurricane season would be over essentially forever,

we'd have huge problems on our hands, like a dwindling supply of fresh water 

and a much, much hotter planet. 

 

Transcription: 

From thin and wispy to big and puffy, clouds cover about 70% of the planet 

at any given moment. But what if, in the next minute, poof, they all disappeared?

That instant might shock onlooking astronauts on the space station. But someone

who is, say, hiking in the desert wouldn't know right away that things on Earth 

were about to get really bad. Within a few days, though, the first warning sign 

would show up: humidity. It'll be even worse if you live by the coast. Normally, 

the sun's heat evaporates water, mostly from the ocean, and that water vapor

is condensed into clouds. But if clouds are cut out of the Earth's water cycle,

that water just hangs around in the air, creating close to 100% humidity.

If you were to get on a flight, you might experience more turbulence than usual.

Without the protective cover of clouds to bounce sunlight into space, the sun 

will heat the Earth more, creating more rising, uneven hot air. But a bad flight 

may be the least of our worries, because there'll be no more rain or snow

or even a light mist, and that means there won't be any way to replenish the 

water sources we drink from, like lakes, streams, rivers, springs, and aquifers.

So once last winter's snow melts, we're stuck with whatever water we have 

on hand. And the clock is ticking. If the world were to keep up its current

water-consumption rate, we would drain all of the freshwater lakes and rivers

in about 23 years. So to conserve our freshwater supply, humanity will have

to be strategic. Today, the average American uses about 80 to 100 gallons 

of water every day. But saving ourselves is going to take more than just skipping

long showers and laundry. The water we use in our home and public places 

accounts for only 21% of our water usage. The two biggest demands are 

actually thermoelectric power to generate electricity and irrigation for farms.

Not only do power plants use tons of water, ones that run on nuclear fuel 

could spell disaster if their water-cooling towers run dry. The 2011 Fukushima

nuclear disaster, for example, was set off when an earthquake knocked out 

power to its water-cooling pumps. And farms are going to need even more

water without the help of a good rain. This permanent drought would kill tons

of wild vegetation and animals as the land dries up Within a few years, eroding

soil may kick up giant dust storms like the Dust Bowl in the 1930s. Meanwhile, 

Earth's climate will be going haywire without clouds. It's hard to say when this 

will all happen without some very expensive climate modeling, but cloud expert

Chris Fairall did offer some quick back-of-the-envelope calculations. Without 

clouds, average surface temperatures would rise by as much as 22 degrees 

Celsius. This extreme temperature spike would not only destroy the habitats

of most flora and fauna, killing off whatever survived the drought, it would also

melt the polar ice caps and cause massive flooding of coastal cities. 

You might end up being part of the 40% of the world that would be forced 

inland, and your new home might soon be in an endless desert as seawater

starts seeping into our fresh and precious groundwater. Sounds alarming, 

but there are some silver linings to a world without clouds. No more devastating

hurricanes and tornadoes, or delayed flights because of stormy weather, 

or cloudy skies to ruin your stargazing. As the water supply dwindles, we'll have 

to make some hard choices, but, hey, humans are creative. We could invent 

ways to desalinate ocean water or collect all that water vapor from the air. 

And the sooner we do it, the better, because in reality, we're already losing 

clouds. Unprecedented levels of CO2 and the warming oceans and atmosphere

are all causing clouds to thin out. So despite the silver linings, it might be best 

to reduce our greenhouse gas emissions 

 

Questions: 

1. How many percent does clouds cover the planet?

2. How are clouds form? 

3. Talk about the importance of the clouds.

   What would happen when clouds disappear?


첨부파일 Uploaded File : 20210303125634_E1QAC.jpg  
Wind
Sheep shorn of 35kg fleece after being rescued in Australia