时间:2019-01-27 作者:英语课 分类:PBS访谈环境系列


英语课

   HARI SREENIVASAN, PBS NEWSHOUR WEEKEND ANCHOR: Scientists studying climate change in Antarctica reported this week that the hole in the protected ozone 1 layer of the earth's atmosphere has shrunk. The discovery of the hole in the mid-1980s led to a worldwide facing out of ozone-depleting chemicals known as chlorofluorocarbons, which had been used in products ranging from hairspray to air conditioners.


  Joining me now from Denver to discuss how that policy has worked and how the hole is healing is Alexandra Witze, a reporter for "Nature Magazine".
  So, I guess the first thing is, is that this is sort of a success story. I mean, humanity actually together, did something and that we're seeing some results.
  南极臭氧层空洞有所缩小
  ALEXANDRA WITZE, NATURE MAGAZINE: Yes, it's a pretty rare environmental success story. I mean, you can say that we caused the problem in the first place by emitting all these chemicals, but the world basically got together and in 1987, put together a global treaty called the Montreal Protocol 2 that essentially 3 banned these chemicals that had been chewing away at the ozone layer.
  So, yes, it's good news. It's a good story for once in the environment.
  HARI SREENIVASAN: And this — I should be sure to mention that this doesn't mean that everything is fixed 4. This is a long slow process. They're just finding that it's gotten better.
  ALEXANDRA WITZE: Sure. What the scientists announced this week is that year over year, on average, the ozone hole is getting just a little bit smaller every year. From 2000 to 2015, it shrank by 4 million square kilometers over that whole period. It doesn't sound like a whole lot, but it means that overtime 5, this opening that is letting all these nasty ultraviolet radiation is gradually shrinking and that's good news for us here in earth.
  HARI SREENIVASAN: This is the hole that they measure is primarily over the South Pole. The ozone layer, of course, is over the entire planet, right?
  ALEXANDRA WITZE: Yes. So, ozone is kind of like a protected shield in the upper atmosphere. You can think of it like a blanket enveloping 6 the earth and protecting us from these ultraviolet rays. What happens is these chemicals that are emitted get caught up into the upper atmosphere and they get transported towards the Polar Regions. And over the South Pole, they start to trigger these chemical reactions that chew away at this protected blanket.
  So, even though ozone is all around the planet, and even though we're emitting stuff, you know, around cities, what happens is these chemicals get transported down to the South Pole. And so, that's where we see the hole opening up every year.
  HARI SREENIVASAN: And last year, or maybe it was a year before, I can't remember, some volcanic 7 eruptions 9 actually had a negative impact on this. So, even though we weren't cranking out the hairspray cans, the earth still has the ability to disrupt the ozone layer.
  ALEXANDRA WITZE: Yes, this was one of the really puzzling things last year. In October, scientists saw one of the biggest ozone holes on record, and they didn't really understand why, because we've been phasing out these chemicals and everything seemed to be on track to healing. It turned out it was a volcano to blame. There was an eruption 8 in Chile in April of last year, and basically, the particles that this eruption put out go into the upper atmosphere and they also start to trigger the same ozone-destroying reactions.
  So, even though we've been cleaning up our act, volcanoes can still get in there and cause trouble as well.
  HARI SREENIVASAN: It seems that perhaps it's the narrow focus of the chemicals in terms of why this worked. I mean, because a lot of people will ask, well, why can't humanity get together like this around climate change and carbon emissions 10 overall?
  ALEXANDRA WITZE: Yes, this was sort of a tractable 11 problem, as environmental problems go. I mean, there is a huge industry, of course, that made these air conditioners and refrigerants that had these chemicals. But basically, technology came up with alternatives. And so, we were able to swap 12 out the air conditioners and the refrigerants that had these nasty ozone-destroying chemicals with ones that didn't.
  So, that was a fairly easy problem — not easy but a doable problem to solve. It's harder with greenhouse gasses and carbon pollution because they're so many sources, right? Power plants, deforestations, cement production. It's not just one thing to swap out for the climate change and carbon emissions.
  So, that's — there might be lessons to learn, I think, from the ozone success story but it's going to be a lot bigger challenge with climate change.
  HARI SREENIVASAN: All right. Alexandra Witze from "Nature" — thanks so much for joining us.
  ALEXANDRA WITZE: Thank you.

n.臭氧,新鲜空气
  • The ozone layer is a protective layer around the planet Earth.臭氧层是地球的保护层。
  • The capacity of ozone can adjust according of requirement.臭氧的产量可根据需要或调节。
n.议定书,草约,会谈记录,外交礼节
  • We must observe the correct protocol.我们必须遵守应有的礼仪。
  • The statesmen signed a protocol.那些政治家签了议定书。
adv.本质上,实质上,基本上
  • Really great men are essentially modest.真正的伟人大都很谦虚。
  • She is an essentially selfish person.她本质上是个自私自利的人。
adj.固定的,不变的,准备好的;(计算机)固定的
  • Have you two fixed on a date for the wedding yet?你们俩选定婚期了吗?
  • Once the aim is fixed,we should not change it arbitrarily.目标一旦确定,我们就不应该随意改变。
adj.超时的,加班的;adv.加班地
  • They are working overtime to finish the work.为了完成任务他们正在加班加点地工作。
  • He was paid for the overtime he worked.他领到了加班费。
v.包围,笼罩,包住( envelop的现在分词 )
  • Always the eyes watching you and the voice enveloping you. 那眼睛总是死死盯着你,那声音总是紧紧围着你。 来自英汉文学
  • The only barrier was a mosquito net, enveloping the entire bed. 唯一的障碍是那顶蚊帐罩住整个床。 来自辞典例句
adj.火山的;象火山的;由火山引起的
  • There have been several volcanic eruptions this year.今年火山爆发了好几次。
  • Volcanic activity has created thermal springs and boiling mud pools.火山活动产生了温泉和沸腾的泥浆池。
n.火山爆发;(战争等)爆发;(疾病等)发作
  • The temple was destroyed in the violent eruption of 1470 BC.庙宇在公元前1470年猛烈的火山爆发中摧毁了。
  • The eruption of a volcano is spontaneous.火山的爆发是自发的。
n.喷发,爆发( eruption的名词复数 )
  • There have been several volcanic eruptions this year. 今年火山爆发了好几次。 来自《简明英汉词典》
  • Over 200 people have been killed by volcanic eruptions. 火山喷发已导致200多人丧生。 来自辞典例句
排放物( emission的名词复数 ); 散发物(尤指气体)
  • Most scientists accept that climate change is linked to carbon emissions. 大多数科学家都相信气候变化与排放的含碳气体有关。
  • Dangerous emissions radiate from plutonium. 危险的辐射物从钚放散出来。
adj.易驾驭的;温顺的
  • He was always tractable and quiet.他总是温顺、恬静。
  • Gold and silver are tractable metals.金和银是容易加工的金属。
n.交换;vt.交换,用...作交易
  • I will swap you my bicycle for your radio.我想拿我的自行车换你的收音机。
  • This comic was a swap that I got from Nick.这本漫画书是我从尼克那里换来的。
标签: PBS
学英语单词
a-c bias
artificial transition
ascogenous
bacterial plant disease
be meat and drink for someone
be symptomatic of
bird-arm
bivariate function generator
breise
buttfuck
by-passage
cellulose film
chandly
choke up with
column with constant cross-section
control diode
corpsing
creep crack
cross-bred
cruising horse-power
crural sarcoma
CubeSat
curli
dalin
differential receiver statics
din-dins
dire
Draw Sample
eases up
ex-users
fresh infusion of senna
gaitas
George Sandism
golfingia margaritacea margaritacea
gravity segregation
independent sample design
indicator pressure
indirect gap semicondutor
infighting
interfacial angle
invoice outward
keeners
Kuznets cycle
laparocystectomy
Lummus cracking process
Maakel Region
mabrouk
Masubia
Mazak alloys
medium-temperature salt bath rectifier
milliken conductor
miracle cure
monocolous
Moral de Calatrava
nanoresistor
non-homing-type rotary switch
nuisance values
optical-discs
penicillium janczewskii
persistent pesticide
plagueful
plagueship
practical esthetics
prior equity
produce a play
programming language extension
quarterline
quickbreads
re-advances
recueil
regular-season
repairing base
resilient drive
retiered
retirement table
revhead
Rhodo phyceae
right-front
rigid-tine rotary cultivator
riparias riparias
sack tap
Salsola tragus
sericite in powder
sex-conditioned inheritance
sham eating
silk gauze
socket cover
solidago spathulatas
spare wire
spheric scale
stereoblastula
stream flow routing
superintendent engineer
swizzles
thermal denaturation
Troyish
trufan
type ahead
ubundu (ponthierville)
venae hypogastrica
Xenoantibodies
Zonabris