Please look at the methane digester, second entry. This could be a substitute for charcoal.
http://tilz.tearfund.org/Publications/Footsteps+41-50/Footsteps+46/Alter...
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cooking fuel
Please look at the methane digester, second entry. This could be a substitute for charcoal.
http://tilz.tearfund.org/Publications/Footsteps+41-50/Footsteps+46/Alter...