Biochar Stability and Carbon Sequestration
One and a half page summary followed by several pages of references with personal notes. Biochar can be stable for centuries in soil, but not all biochar, there are ways to measure differences, and these are very important in planning climate change mitigation strategies.
A Comprehensive Biochar Discussion: Definition, context, characteristics, benefits, and how to apply
At 5 pages, this article is more comprehensive: a discussion of what biochar is, a modern context, material characteristics, benefits, and how to apply. References included.