This Topic Reprint will discuss the latest technological developments and cutting-edge research in "sustainable/green technologies", especially in areas like waste-to-energy, sustainable materials, green technology for environmental remediation, renewable/clean energy, greenhouse gas reduction, climate change mitigation, resource recovery, natural resource management, and AL/ML use in environmental sustainability, with the goal of addressing the most pressing environmental issues facing our society. In this Reprint, leading experts in this field shared their research findings, key challenges, and future prospects for advancing these technologies across various sectors in the field of environmental sustainability to provide technological solutions to create a more sustainable and resilient planet for future generations.