Retraction Notice: The publisher wishes to retract the chapter Dev Kumar Mandal, Brijlal Mallik, Shivangi Kashyap, Vivek Hamal, Krishnendu Ghosh, 2026. “Environmental Impacts and Sustainability of Hydrogen Energy”, Green Technology and the Circular Economy: Towards a Sustainable Future, Krishn Awatar Goyal, R. Sivasamy, Teena Mertiya. It has come to our attention from the authors that this chapter was also published in another book by the same authors: Dev Kumar Mandal, Brijlal Mallik, Michael L. Johns, Shivangi Kashyap, Vivek Hamal and Krishnendu Ghosh (2026) “Environmental Impacts and Sustainability of Hydrogen Energy”, Hydrogen Energy Systems: Advancing Sustainable Power Solutions, Krishan Arora (Ed.), Himanshu Sharma (Ed.), Suman Lata Tripathi (Ed.), Sandesh S. Chougule (Ed.). The Emerald Publishing’s submission guidelines make it clear that chapters must be original and not infringe any existing copyright. The publisher sincerely apologizes to the readers. The authors would like to note that they agree with the retraction.