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

过去，备选材料为碳黑，这是一种石油产品不完全燃烧后形成的黑色物质。

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

我们想，自然界的东西能来代替碳黑吗?

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

对于黑色记号笔，制造商以使用一种叫做碳黑的细粉末。

The carbon black can be reused to make new tires.

碳黑以重复利用来制造新轮。

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

井中，爆破是通过将二氧化碳中的碳黑浸泡液氧中，然后再用火花点燃来完成的。

What is left behind is pure carbon black.

留下的是纯碳黑。

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

整个过程的产出按重量计算是40%热解油，30%碳黑，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.

产新的碳黑需要部分燃烧重油残渣或煤，这会产大量的温室气体排放。

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

第二种是碳黑， 一种粉末状、类似烟灰的碳形式， 用于提高耐用性。第三种是橡胶。