Rapid urbanization and globalization have intensified environmental challenges worldwide, particularly through rising anthropogenic greenhouse gas (GHG) emissions such as carbon dioxide and methane. Open dumping of municipal solid waste (MSW) is a major contributor, as the organic fraction undergoes anaerobic decomposition and releases significant amounts of methane, a potent GHG with considerable energy potential if effectively captured. This study investigates landfill gas (LFG) generation, with emphasis on methane recovery, from MSW in Dhaka city for the period 2016–2030 using the LandGEM 3.02 version. The results indicate cumulative LFG production, methane emissions, and energy recovery potential of 177.10 × 106 m3, 1.20 × 109 m3, and 2.95 × 109 kWh/year, respectively, with a corresponding CO2 avoidance of approximately 2.54 × 109 kg CO2 per year. Economic analysis demonstrates feasibility with a positive Net present value (NPV) of 1.95 billion BDT, an LCOE of 2.10 BDT/kWh and payback period (PBP) of approximately 16 years. These findings suggest that methane utilization from MSW not only mitigates GHG emissions but also provides a sustainable pathway for energy generation, supporting Industry 5.0 goals of cleaner, smarter and more responsible technologies.