1.   Cast Iron Iron with a high carbon content.

2.   The percentage carbon content of a coal is important because the calorific value depends on it.

3.   The total carbon content has, therefore, been taken as the carbon content and quoted as a percentage weight.

4.   Wrought Iron Iron possessing a very low carbon content, which makes it tough and malleable.

5.   It would be based on the carbon content of fuels and would have the biggest effect on the coal industry.

6.   Half the new tax would be on the carbon content of fossil fuel and half on the energy content.

7.   At Arizona State University, a geologist analyzed moon rocks for carbon content, a key ingredient for life.

8.   About half of the growth came from increased sales of electricity, and about half from increased use of coal and other fuels with high carbon content.