1. Sustainable biochar production technologies 2. Sustainability of biochar production in biowaste management 3. Biochar for sustainable construction 4. Biochar for sustainable drainage systems 5. Sustainable application of biochar for water purification 6. Role of biochar in sustainable wastewater treatment 7. Role of biochar in nutrients recovery from wastewater 8. Application of Biochar for Improving Sewage Sludge Treatment 9. Sustainable application of biochar for stormwater reuse 10. Biochar for sustainable soil remediation 11. Biochar for sustainable agriculture 12. Sustainable application of biochar for energy storage and conversion 13. Role of biochar in Polyaromatic Hydrocarbons Remediation and Environment Management 14. Environmental sustainability-based comparison between biochar and hydrochar in respect of production, properties, applications and perspectives 15. Sustainability assessment of the application of biochar 16. Sustainability assessment of biochar for climate change mitigation