anybody can turn anything into graphite. Graphite is carbon.
Burn it.
Graphite, carbon, charcoal.
burn it under low or no oxygen conditions.
Capacitors use a lot of carbon/graphite.
There are a lot of very special types of carbon that have crazy properties. One type of carbon is different than another. But you take grass clippings, you burn them in low oxygen conditions - like an oven, compared to a roaring fire - you'll have carbon / graphite. You can take those burnt grass clippings and bury them. You will have sequestered carbon by doing so. You solved global warming!!!
you can take any mix of biomass and grass clipping, combine with the shitty dirt and clay soil, make bricks, burn it, you have better soil than you had before. Burnt dirt combined with charcoal / carbon / graphite is better than what you had before.