First, it adds organic carbon to the soil, encouraging bacterial growth.

Adding finely powdered carbon, aluminum, titanium, and boron to hydrogen and kerosene have been studied.

Concurrent with the transition from bronze to iron was the discovery of carburization, the process of adding carbon to wrought iron.

Biomass briquettes are a renewable source of energy and avoid adding fossil carbon to the atmosphere.

Since the industrial revolution, human activity has modified the carbon cycle by changing its component's functions and directly adding carbon to the atmosphere.

To drill for oil, you're taking carbon out from underneath the surface of the earth and burning it, adding carbon to the air that wasn't already there.

Interaction between adding carbon to steel and quenching.

Steel was manufactured by the reverse process of adding carbon to carbon-free wrought iron, usually imported from Sweden.

Whereas burning oil and coal adds new carbon to the atmosphere, carbon that was very nicely sequestered before we burned it.

However adding too much carbon can make it brittle.