NGMN e.V. has released a report titled "Green Future Networks Sustainability Challenges and Initiatives in Mobile Networks," which outlines the sustainability challenges and initiatives in the mobile network industry. The report was submitted by Saima Ansari and Javan Erfanian, with contributions from various industry experts. The report is intended for public consumption and was approved by the NGMN Board on July 9th, 2021. The report provides an overview of the current state of sustainability in the mobile network industry and highlights the challenges and initiatives that are being taken to address these challenges.