Not forever.

永遠ではなく、例えば5秒間？

Just for say, five seconds?

これは "WHAT IF "だ、

Would we just hold our breath?

What would happen to the atmosphere?

そしてこうなる

What would happen to the environment?

もし世界がたった5秒間酸素を失ったとしたら。

This is What If and here's what would happen if the world lost oxygen for just five seconds.

深呼吸をするんだ。

Take a nice deep breath. Feel how satisfying that is?

それがどれほど満足のいくものか、お分かりいただけただろうか？

What you're breathing in is oxygen.

吸っているのは酸素だ、

And it takes up roughly 21% of our atmosphere with 78% being nitrogen.

大気中のおよそ21％を占める、

Although it's not the most abundant gas in our atmosphere, it is the most important.

78％が窒素である。

Without oxygen, plants, animals, water and us, humans wouldn't be where we are today.

大気中に最も多く存在するガスではないが、

Five seconds may not sound like a whole lot of time to be without oxygen.

それが最も重要だ。

Most of us can go at least 30 seconds without taking a breath, so it would happen too fast for your body to even notice.

酸素がなければ、植物も動物も水もない、

Your breathing would actually remain norma, but as for everything else, not so much.

そして、私たち人類は今日の地位を得ることはなかっただろう。

In just five seconds, the earth would look completely different.

5秒という時間は、酸素がない状態としてはそれほど長くはないように聞こえるかもしれない。

Without oxygen, you can say goodbye to the Hoover Dam, the Pantheon Dome and anything else made of concrete.

私たちのほとんどは、少なくとも30秒間は息をせずにいられる。

These structures would instantly collapse.

Oxygen acts as a special binding agent to concrete.

あまりにあっという間の出来事で、体が気づかないほどだ。

Without it, concrete is just dust.

呼吸は正常のままだ。

Speaking of buildings, any untreated metal would instantly be fused together.

しかし、それ以外のことについては？

This is because there's a layer of oxidation on metals that prevents them from welding together.

そうでもないよ。

Without that layer, metals would instantly bind to each other.

たった5秒で、地球の姿はまったく変わってしまう。

If you happen to be relaxing at the beach at the time, expect a severe sunburn.

酸素がなければ、フーバーダムともお別れだ、

The ozone layer, our protection against the sun's UV rays is made of oxygen.

Take away the oxygen and the earth would become extremely dangerous.

パンテオン・ドームをはじめ、コンクリートでできたものはすべてそうだ。

There would be nothing protecting us from the sun's UV rays.

これらの構造物は即座に崩壊するだろう。

In addition to a sunburn, our inner ear would explode.

酸素はコンクリートに特殊な結合剤として作用する。

Losing oxygen means losing 21% of our air pressure.

A change in air pressure that drastic is equivalent to being at sea level and dropping down 2000 meters instantly.

それがなければ、コンクリートはただの埃だ。

Our ears wouldn't have enough time to adapt.

建物といえば、

Having a good time yet? Well, don't expect it to last long.

未処理の金属であれば、瞬時に融合してしまう。

Without oxygen, there's no fire.

これは、金属には酸化層があるからだ。

The combustion process in vehicles wouldn't be able to occur.

このため、両者の溶接は不可能である。

Any mode of transport that isn't electric will automatically fail.

Planes will fall from the sky and millions of cars will be stopped in their tracks.

この層がなければ、金属同士は瞬時に結合してしまう。

The sky would be completely dark.

そのときたまたまビーチでくつろいでいたらね、

Before it hits the earth, light from the sun bounces off multiple particles in the air.

Without oxygen in the atmosphere, there are less things to bounce off and the sky will appear dark.

ひどい日焼けが予想される。

Oh yeah, and while all this is happening, the earth's crust would completely crumble.

太陽の紫外線から身を守るオゾン層は、酸素でできている。酸素を取り除けば、地球は非常に危険な状態になる。

That's because Earth's crust is made up of 45% oxygen.

太陽の紫外線から私たちを守るものは何もない。

The crust would crumble and continue to crumble until there's nothing left, sending you and everyone on the planet into a free fall.

日焼けに加えて、内耳が破裂してしまう。

Sound like fun? Probably not.

酸素を失うということは、気圧の21％を失うということだ。気圧の急激な変化

But luckily, you can take a deep breath of 21% oxygen, knowing this will never happen.

というのは、海面にいて瞬時に2000メートル下がるのと同じことだ。

For more things that are fun to speculate on, keep checking back with What If.

耳が適応するのに十分な時間がないのだ。