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Climate change is a global problem and carbon sequestration is one of the possible ways to reduce it. After application of organic matter to the soil, most of the carbon is mineralized and released into the atmosphere where it becomes a part of the greenhouse gas. Biochar is also an organic matter but it contains carbon in a form that is mineralized slowly (hundreds to thousands years). In addition to these complex compounds, it also contains readily available carbon and also aromatic substances which may be toxic...