Dedication Acknowledgments Preface Section 1: Basic understanding 1. Introduction to biogas and biomethane 2. Recent Advances of Biogas Production Section 2: Technical aspects 3. Absorption Technology for upgrading biogas to biomethane 4. Adsorption Technology for upgrading biogas to biomethane 5. Recent advances on photosynthetic Biogas Upgrading to Biomethane Section 3: Computational and modelling 6. Modelling for upgrading biogas to biomethane Section 4: Combinations and alternatives aspects 7. Biomethanation at psychrophilic temperatures 8. Microbial co-culture to enhance biogas production 9. From Emissions to Opportunities: Harnessing Bio CO2 for Sustainable Industry Applications Section 5: Socio-Economical aspects 10. Waste to biomethane: advent of circular economy Section 6: Sustainability and globalization 11. Life Cycle Assessment of Biomethane technology 12. Techno-economic study of biogas to biomethane 13. Policy designs for biomethane promotion