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Four hundred parts per million: that's the approximate concentration of CO2 in the air today. What does this even mean?
百萬(wàn)分之四百：這就是現(xiàn)在空氣里二氧化碳大概的濃度。這意味著什么呢？
For every 400 molecules of carbon dioxide, we have another million molecules of oxygen and nitrogen.
意味著每四百個(gè)二氧化碳分子，都混了另外一百萬(wàn)個(gè)氧和氮分子。
In this room today, there are about 1,800 of us.
今天這個(gè)房間里大概有1800人。
Imagine just one of us was wearing a green shirt, and you're asked to find that single person.
想象一下我們當(dāng)中只有一個(gè)人穿著綠色襯衫，而你被要求找到那個(gè)人。
That's the challenge we're facing when capturing CO2 directly out of the air.
這就是我們從空氣中直接捕獲二氧化碳需要面臨的挑戰(zhàn)。
Sounds pretty easy, pulling CO2 out of the air. It's actually really difficult.
把二氧化碳從空氣中提取出來(lái)，聽(tīng)起來(lái)很簡(jiǎn)單，但這實(shí)際上是個(gè)很復(fù)雜的過(guò)程。
But I'll tell you what is easy: avoiding CO2 emissions to begin with.
但我要告訴你什么是簡(jiǎn)單的：在源頭減少二氧化碳排放。
But we're not doing that. So now what we have to think about is going back; pulling CO2 back out of the air.
但是我們并沒(méi)有真正這樣做。所以我們現(xiàn)在得考慮如何逆轉(zhuǎn)現(xiàn)狀；將二氧化碳從空氣中移除。
Even though it's difficult, it's actually possible to do this.
雖然這個(gè)過(guò)程很困難，但是依然有可能實(shí)現(xiàn)。
And I'm going to share with you today where this technology is at and where it just may be heading in the near future.
我今天將與你們分享用來(lái)移除二氧化碳的科技，以及在不久的將來(lái)，它會(huì)朝哪個(gè)方向發(fā)展。
Now, the earth naturally removes CO2 from the air by seawater, soils, plants and even rocks.
地球能夠自然地通過(guò)海水，泥土，草木甚至是石頭將二氧化碳從空氣中移除。
And although engineers and scientists are doing the invaluable work to accelerate these natural processes,
盡管工程師和科學(xué)家們?yōu)榱思涌爝@個(gè)自然的過(guò)程做了許多寶貴的工作，
it simply won't be enough. The good news is, we have more.
但還遠(yuǎn)遠(yuǎn)不夠。好消息是，我們還有別的技術(shù)。
Thanks to human ingenuity, we have the technology today to remove CO2 out of the air using a chemically manufactured approach.
感謝人類(lèi)的聰明才智，我們今天才能擁有通過(guò)化學(xué)制造將二氧化碳從空氣中移除的科技。
I like to think of this as a synthetic forest.
我把它稱(chēng)為人工森林。
There are two basic approaches to growing or building such a forest.
總的來(lái)說(shuō)，有兩種方法可以實(shí)現(xiàn)人工森林。
One is using CO2-grabbing chemicals dissolved in water.
一種是使用溶于水的二氧化碳捕集材料。
Another is using solid materials with CO2-grabbing chemicals.
另一種是使用固態(tài)的二氧化碳捕集材料。
No matter which approach you choose, they basically look the same.
無(wú)論你選擇哪種方法，它們看起來(lái)都差不多。
