When humans started draining the natural topsoil, and ploughing it up for planting, they exposed the buried carbon to oxygen.

当人类耗尽自然表层土并开始为了耕种而犁田时，他们就把土壤掩藏碳质暴露在了氧气。

Is it a big hunk of iron, or is it mostly crumbly carbonaceous s tuff?

它是一大块铁，还是主要由易碎碳质物质构？

They said that they had found remnants of carbonaceous chondrites on the moon's far side in hyperspectral images in the visible and near-infrared range taken by the rover.

他们说，在月球车摄可见和近红外范围内谱图像，他们发现了在月球背面碳质球粒陨石残留物。

Tons of carbon have been stripped from the world's soils — where it's needed — and pumped into the atmosphere.

大量碳都被从地球土壤剥离了出来，灌进了大气，但是土壤才是需要碳质地方。

There he met a pioneer in the study of global warming, who suggested that carbon from the soil had moved into the atmosphere.

他在那儿遇见了一位研究全球变暖先驱，这位研究人员提出，土壤碳质都挥发进大气里了。

Carbon-rich soil is dark, crumbly and fertile, and retains some water.

碳质丰富土壤颜色很深，易碎且肥沃，而且还能留住一些水分。

Jones and 12 farmers are working to build up soil carbon by cultivating grasses that stay green all year round.

Jones和12位农民正在一起通过培育全年常绿草来增加土壤碳质。

Rattan Lal argues that farmers should receive payment not just for the corn or beef they produce but also for the carbon they can store in their soil.

Rattan Lal认为农民应该不仅从他们生产玉米和牛肉获利，还应该为他们在土地能够储存碳质获得报酬。

It turns out that the most likely source for Earth's water is a type of meteorite called a carbonaceous chondrite.

事实证明，地球上水最可能来源是一种名为碳质球粒陨石陨石。