**Acknowledgements**

Rajib Sinha gratefully acknowledges FORMAS (project number 2018-01545) for financial support to write the chapter. This work was supported by the Swedish Energy Agency [2018-002148], Sweden's innovation agency (Vinnova) and Formas - a Swedish Research Council for Sustainable Development.

*The Role of Biochar Systems in the Circular Economy: Biomass Waste Valorization and Soil… DOI: http://dx.doi.org/10.5772/intechopen.104389*
