<p>Part 1Biochar technology: fundamental principles<br>1. Biochar for environmental remediation at a glance: principles, applications, and prospects<br>2. Feedstocks, preparation, and characteristics of pristine biochars<br>3. Development of novel engineered/functionalized biochars<br>4. Design, characterization, and evaluation of biochar: recent advances, applications, and future research directions<br>5. Harnessing biochar for sustainable catalysis in environmental applications<br>Part 2 Biochar for contaminated land remediation<br>6. Biochar remediation of inorganic contaminants in soils<br>7. Biochars for the remediation and repurposing of postmining landscapes and metalliferous substrates: applications and future perspectives<br>8. Biochar remediation of conventional and emerging organic contaminants in soils<br>9. Biochar for remediation of petroleum hydrocarbons in soil, sediments, and sludge<br>Part 3 Biochar for water and wastewater treatment<br>10. Removal of contaminants in drinking water using biochars<br>11. Biowaste-derived biochars for treatment of wastewater contaminated by dyes<br>12. Removal of per- and polyfluoroalkyl substances in environmental matrices by biochars: mechanisms, fate, and research needs<br>13. Application of biochar for the treatment of urban stormwater: processes and future directions<br>14. Treatment of industrial and municipal wastewaters using biochar: performance, mechanisms, and research needs<br>Part 4 Biochar sytems for clean and renewable energy<br>15. Electrochemical properties of biochar for environmental applications: advances, challenges, and perspectives<br>16. Biochar in bioelectrochemical systems: applications and future directions<br>17. Thermochemical treatment of human excreta to energy and biochar: recent advances, applications, and future directions<br>Part 5 Biochar systems for air pollution control<br>18. Clean and efficient biochar cookstoves for mitigation of indoor air pollution<br>19. Biochars for the removal of toxic gaseous contaminants: state-of-the-art and future directions<br>Part 6 Assessment of biochar systems<br>20. Regeneration, recycling, and disposal of spent biochars<br>21. Life cycle assessment for biochar systems: a review<br>22. Potential environmental and human health risks of biochar systems: a call for comprehensive health risk assessments<br>23. Techno-economic assessment of biochar systems: state-of-the-art and future research directions<br>Part 7 Looking ahead: future perspectives and epilogue<br>24. Biochar for environmental remediation and beyond: a “twin or multiple solutions” heuristic framework for uptake, adoption, and impact<br>25. Moving ahead with biochar for environmental remediation and beyond: future research directions, roadmap, and epilogue</p>