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And now once you've captured the CO2,
在二氧化碳被捕獲之后，
you have to be able to recycle that material that you used to capture it, over and over again.
我們還需要能夠循環(huán)使用用來捕獲它的材料，持續(xù)不斷進(jìn)行捕獲。
The scale of carbon capture is so enormous that the capture process must be sustainable,
畢竟，當(dāng)碳捕獲具備了龐大的規(guī)模，其捕獲方法必須能夠滿足長遠(yuǎn)需求
and you can't use a material just once.
并能重復(fù)利用材料。
And so recycling the material requires an enormous amount of heat, because think about it:
另外，重復(fù)利用材料的過程需要消耗大量的熱量，試想一下：
CO2 is so dilute in the air, that material is binding it really strong,
二氧化碳在空氣中是如此稀薄，材料對它的約束力就會非常大，
and so you need a lot of heat in order to recycle the material.
你需要消耗很多熱量才能回收這個(gè)材料。
And to recycle the material with that heat,
所以你消耗熱量回收材料時(shí)，
what happens is that concentrated CO2 that you got from dilute CO2 in the air is now released, and you produce high-purity CO2.
從空氣中收集的濃縮二氧化碳將被釋放出來，你將得到高純度的二氧化碳。
And that's really important, because high-purity CO2 is easier to liquify, easier to transport,
這一點(diǎn)很重要，因?yàn)楦呒兌鹊亩趸几菀滓夯急葰鈶B(tài)二氧化碳更容易運(yùn)輸，
whether it's in a pipeline or a truck, or even easier to use directly, say, as a fuel or a chemical.
無論是利用管道還是卡車，甚至更容易被直接使用，比如作為燃料或者化學(xué)品。
So I want to talk a little bit more about that energy.
關(guān)于能量，我想再多講一些。
The heat required to regenerate or recycle these materials absolutely dictates the energy and the subsequent cost of doing this.
再生或者回收那些材料的熱量需求決定了這個(gè)過程需要的能量和附隨的成本。
So I ask a question: How much energy do you think it takes to remove a million tons of CO2 from the air in a given year?
我想問一個(gè)問題：你覺得在一年內(nèi)從空氣中移除一百萬噸的二氧化碳需要多少能量？
The answer is: a power plant. It takes a power plant to capture CO2 directly from the air.
答案是：一個(gè)發(fā)電廠。需要一個(gè)發(fā)電廠來提供從空氣中捕獲二氧化碳所需要的能量。
Depending on which approach you choose, the power plant could be on the order of 300 to 500 megawatts.
發(fā)電廠的發(fā)電量，取決于選擇的方法，可能在300到500兆瓦之間。
And you have to be careful about what kind of power plant you choose.
還要謹(jǐn)慎選擇發(fā)電廠的燃料類別。
If you choose coal, you end up emitting more CO2 than you capture.
如果選擇的是煤，產(chǎn)生的二氧化碳會比捕獲的還多。
