In the past, the material of choice has been carbon black, a sooty substance made by the incomplete combustion of petroleum products.

过去，备选材料为碳，这是一种石油产品不完全燃烧后形成色物质。

We thought how about replacing that carbon black with something from nature?

我们想，自然西能来代替碳吗?

For black markers, for example, manufacturers can use a fine powder called carbon black.

对于色记号笔，制造商使用一种叫做碳细粉末。

The carbon black can be reused to make new tires.

碳重复利用来制造新轮胎。

Down in the mine, blasting was done by soaking carbon black from CO2 in liquid oxygen and then firing it with a spark.

在矿井中，爆破是通过将二氧化碳中碳浸泡在液氧中，然后再用火花点燃来完成。

What is left behind is pure carbon black.

留下是纯碳。

The overall output of the process by weight is 40% TDO, 30% carbon black, 20% steel and 10% gas.

整个过程产出按重量计算是40%热解油，30%碳，20%钢和10%气体。

Producing new carbon black requires the partial burning of heavy oil residues or coal, which produces plenty of greenhouse gas emissions.

生产新碳需要部分燃烧重油残渣或煤，这会产生大量温室气体排放。

The second is carbon black, a powdery, soot-like form of carbon used to improve the durability The third is rubber.

第二种是碳， 一种粉末状、类似烟灰碳形式， 用于提高耐用性。第三种是橡胶。