One of the first workshops in our F.A.R.M. Hack series was about Biochar - what it is, what it does, and how to make it. Stephen Smith, co-founder of F.A.R.M., used "hands-on" participation with a group of veterans to build and demonstrate a J-shaped rocket-stove Biochar cooker, or kiln, using metal drums, and fire brick.
Here's a link to the ATTRA - NCAT website with some important information about Biochar -
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