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Switzerland-based Climeworks and US-based Global Thermostat use a different approach.
位于瑞士的Climeworks和位于美國的Global Thermostat使用的則是不同的方法。
They use solid materials for capture. Climeworks uses heat from the earth, or geothermal,
他們使用的是固體材料捕獲。Climateworks使用來自地球的熱量或者地熱能，
or even excess steam from other industrial processes to cut down on pollution and costs.
甚至是來自其他工業過程的過量蒸汽來減少污染和降低費用。
Global Thermostat takes a different approach.
Global Thermostat則另辟蹊徑。
They focus on the heat required and the speed in which it moves through the material
他們專注于所需的熱量以及它穿過材料的速度，
so that they're able to release and produce that CO2 at a really fast rate,
于是就可以在一個很快的速率下釋放和生產二氧化碳，
which allows them to have a more compact design and overall cheaper costs. And there's more still.
這使得他們采用了更密致的設計，以及整體上更低廉的費用。還有很多這樣的例子。
A synthetic forest has a significant advantage over a real forest: size.
人造森林與天然森林相比有一個顯著的優勢：規模。
This next image that I'm showing you is a map of the Amazon rainforest.
這是亞馬遜熱帶雨林的地圖。
The Amazon is capable of capturing 1.6 billion tons of CO2 each year.
亞馬遜地區每年能捕獲16億噸的二氧化碳。
This is the equivalent of roughly 25 percent of our annual emissions in the US.
大約等于美國每年排放量的百分之二十五。
The land area required for a synthetic forest or a manufactured direct air capture plant to capture the same is 500 times smaller.
而要捕獲等量的二氧化碳所需的人工森林或者人造空氣捕獲工廠，其占地面積只有天然森林的五百分之一。
In addition, for a synthetic forest, you don't have to build it on arable land,
另外，人工森林不需要在耕地上建造，
so there's no competition with farmland or food, and there's also no reason to have to cut down any real trees to do this.
所以并不會占用畜牧和農耕土地，而且我們也不需要砍去任何自然生長的樹木來建造人工森林。
