英語聽力文摘 人工臭氧可行嗎？
構(gòu)建新的臭氧層
Don: Yaël,We’re always hearing that the ozone layer is being depleted, and how bad this is because we need it to protect us from the sun’s harmful ultraviolet rays.
But I’ve been thinking, and there has to be a more effective way to restore the ozone layer than just by sitting around not releasing any more harmful chemicals into the air so the ozone has a chance to repair itself.
Yaël: Ok, like what?
D: Well, how hard could it be to make more ozone? We must have plenty of raw materials.
After all the ozone molecule contains three oxygen atoms–and the oxygen molecules we breathe contain two oxygen atoms, so can we just use that oxygen to produce a bunch of ozone ourselves and stick it back up in the atmosphere?
Y: No!
D: No?
Y:No, we can't manufacture our ozone to replace the ozone hole.
D: Why not?
Y:Several reasons prevent us from doing this. For one thing, ozone in large quantities is extremely hazardous and volatile, which makes it hard to work with, to say the least. Also, the ozone layer is immense–there’s roughly twenty billion tons of it–and we’d have no way of handling such large quantities.
Plus, the ozone layer requires a huge amount of energy to maintain itself, which right now it gets from the sun. Taking over natural ozone production would require more than double the energy the United States produces annually.
That would cause an enormous amount of blackouts.
And that’s why the only way we know to fight ozone depletion is by cleaning up our act and giving nature the chance to take its course.
Don: 我們常常聽到臭氧層正在逐漸消失的消息，這可不是件好事。因?yàn)槌粞鯇颖Ｗo(hù)我們?nèi)祟惷馐芴?yáng)過量的紫外線侵害。
但是，我一直在考慮，比起不再釋放任何有害化學(xué)物質(zhì)到空氣中靜觀其變而言，我們可以采取有效措施修復(fù)破壞的臭氧層。
Yaël: 有何高見?
D:我們不要不少原材料，人工合成更多的臭氧層應(yīng)該不難吧?
畢竟，所有的臭氧分子由三個(gè)氧原子組成;我們呼吸的氧分子包含兩個(gè)氧原子。這樣，我們可以自己用氧氣制造臭氧，以此替代破壞的臭氧層圈。
Y:沒門。
D:沒門?
Y:沒錯(cuò)，我們無法生產(chǎn)臭氧來取代臭氧層空洞。
D:為什么不行?
Y:我們無法辦到，原因諸多。要知道，大量的臭氧是有害且易揮發(fā)的。因此，至少不便于我們運(yùn)作。此外，臭氧層是密集的，大約有200億噸，我們無法操作如此龐大的臭氧。
再者，維護(hù)穩(wěn)定的臭氧層需要不少能量，而這些目前來自太陽(yáng)能。要接手生產(chǎn)天然臭氧層需要的能源是美國(guó)每年生產(chǎn)的兩倍以上。
這有可能會(huì)引發(fā)燈火管制。
這就是我們保護(hù)臭氧層消失的唯一可行辦法是從我們自己做起，愛護(hù)環(huán)境，順其自然。
let nature take its own course：順其自然
blackouts:燈火管制
