[jackweirdy]

The CO2 in plants is 100% from the air, and then goes back into the air when burned

[userinanother]

Too simple of a model. If you used non industrial agriculture it would be mostly correct but industrial agriculture and fertilizer use consumes vast amounts of petroleum products so that’s where the issue lies

[jackweirdy]

What % of the carbon of the plant is fertilizer production?

[hypertele-Xii]

One word: Fertilizer.

[jackweirdy]

Fertilizer itself isn’t carbon. Are you referring to the fertilizer production line or fertilizer itself