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Computare
 Charcoal-Fertilizer Process
From: http://www.eprida.com
Several organizations are proposing to produce charcoal from agricultural wastes as a soil amendment. One proposal generates energy and adds fertilizer as shown in the slide.
Conversion of a fraction  of the wastes from our 24 billion tonnes of agricultural production into long lasting charcoal  could  help counter the 6 billion tonnes of emissions from fossil fuel.
As a mechanical engineer raised on a farm, I’m highly intrigued by this.
We burn fossil fuels to release carbon dioxide. Plants absorb it.  We heat plant material to establish a durable carbon sink which enhances the soil.
Energy will be needed to do this.