In 2011 Biofuelwatch published Biochar: A Critical Review of Science and Policy. In that report we highlighted the uncertainties about biochar including the large land area that would be required to supply biomass for a global scale impact, the contradictory results to date with respect to any long-term carbon sequestration potential (thousands of years as claimed by many proponents who blithely extrapolated from ancient Terra Preta).
Given recent attention to biochar, for example in the context of the IPCC land sector mitigation report, we decided it would be important to update our understanding. We therefore recently reviewed literature published since publication of our report.
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