"Applying graphite tail powder as soil conditioner into the...

"Applying graphite tail powder as soil conditioner into the soils; is related to soil organic carbon and trace element contents and may contribute to increase the soil fertility. Most tropical soils are low in organic matter due to intensive decomposition and consequently low in cation exchange capacity (CEC) which is important for nutrient uptake by roots. Low CEC increases mobility of trace metals in soil [21]; Indonesian soil is dominated by acid or slightly acidic and low CEC soil; two condition which is vulnerable to high rates of bioavailability and leaching [22]. Along with intense precipitation, trace element leaching will happen intensively in tropical soil and decrease the availability for plant roots."

Consider this:

You take biomethane and process it into hydrogen while at the same time sequestering the carbon as graphite.

You then take that graphite and use it as a soil conditioner that improves plant growth ie additional carbon sequestration.

Together you have "supersequestration."

Is there such a word?

There is now.