Rapid urbanization and intensified human activities have significantly increased greenhouse gas (GHG) emissions, contributing to environmental challenges like climate change and global warming. In 2019, global anthropogenic GHG emissions were estimated at approximately 59 GtCO2-eq, with about 11% attributed to the United States (US), making it the second-largest emitter after China. In the United States, the primary components of GHG emissions, in order of their atmospheric abundance, are carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and fluorinated gases. Although CO2 accounts for approximately 80% of all US GHG emissions from human activities, CH4 is a significant concern due to its high global warming potential, which is about 28 times greater than CO2 over 100 years, making it the second most prevalent GHG in the US atmosphere. Significant sources of CH4 emissions in the United States include the natural gas and petroleum industries, livestock enteric fermentation, and landfills. According to the USEPA, municipal solid waste (MSW) landfills are the third-largest anthropogenic source of CH4 emissions in the United States, accounting for 109.4 MMT of CO2 equivalent in 2019. Additionally, landfill gas (LFG), produced from the anaerobic decomposition of MSW, contains a significant amount of CO2. To manage these emissions, engineered landfills are typically installed with gas collection and removal systems and soil-based covers to prevent LFG escape. However, due to the limited effectiveness of these mitigation strategies, fugitive emissions from LFG persist. A novel biogeochemical cover (BGCC) system has been developed to mitigate these fugitive LFG emissions. This system includes a methane oxidation layer (MOL), such as biochar-amended soil, overlain by a carbon dioxide sequestration layer (CSL), such as BOF slag or cement kiln dust (CKD). The MOL enhances the conversion of CH4 to CO2, while the CSL captures the CO2 produced from anaerobic decomposition of MSW and CH4 oxidation. This BGCC system shows an optimized approach that can be adapted beyond landfill applications. This technology, utilizing similar mechanisms for capturing carbon emissions, could be adapted to create filters or biofilters capable of capturing carbon from flue gases emitted by various industries. Such adaptations could be crucial in reducing industrial carbon footprints and supporting broader efforts to mitigate global climate change.