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Now, what would it take in terms of land area to do this, 200 plants?
那么要建造200個工廠，需要多少土地呢？
It turns out that they would take up about half the land area of Vancouver.
事實上，它們將占據溫哥華大約一半的土地面積。
That's if they were fueled by natural gas.
這還是在利用天然氣作為燃料的前提下。
But remember the downside of natural gas -- it also emits CO2.
但是別忘了天然氣的缺點--燃燒時也會排放二氧化碳。
So if you use natural gas to do direct air capture,
所以如果你使用天然氣直接捕獲空氣，
you only end up capturing about a third of what's intended,
你最終只會捕獲到預期量的三分之一，
unless you have that clever approach of co-capture that Carbon Engineering does.
除非你有像Carbon Engineering一樣同時捕獲兩者的方法。
And so if we had an alternative approach and used wind or solar to do this,
如果我們有一個替代的方法，使用風力發電或者太陽能發電，
the land area would be about 15 times larger, looking at the state of New Jersey now.
但隨之所需的土地面積可能會擴大十五倍，和現在的新澤西州一樣大。
One of the things that I think about in my work and my research is optimizing and figuring out
我在工作和研究時經常思考的一件事，就是優化和解決兩個問題，
where we should put these plants and think about the local resources available
將這些工廠放在哪里，以及如何就地取材，
whether it's land, water, cheap and clean electricity
是否有足夠的土地面積，水資源，廉價和無污染的電能，
because, for instance, you can use clean electricity to split water to produce hydrogen,
因為，例如無污染的電能可以把水分解成氫氣，
which is an excellent, carbon-free replacement for natural gas, to supply the heat required.
這是一個極好的，無碳的天然氣替代品，可以提供所需的熱量。
