Landfills continue to be a significant part of waste management strategies even though more waste is being reused, recycled, or energetically valorized. Due to its easy management and capacity for mass manipulation, the landfill is particularly important in many developing countries, where it serves as the primary method for the disposal of biodegradable waste. Recently, researches have demonstrated that landfills are a significant source of greenhouse gas (GHG) emissions. Leachate and gases are produced as a result of waste biodegradation in landfills. Methane and carbon dioxide, both significant greenhouse gases, are the main components of landfill gas. 20% of the world's anthropogenic methane emissions come from landfills. Additionally, it frequently contains a large number of additional gases, some of which are toxic, at low concentrations. These emissions may jeopardise both the quality of the environment and the public’s health. However, there aren’t many reviews in the related fields, so there isn’t a complete understanding of the engineered landfills’ emissions accumulation and their impacts on climate. This study provides comprehensive information on GHG emissions from landfills over the past 20 years and highlights the significance of creating and disseminating up-to-date knowledge frameworks in light of the growing attention being paid to GHG emissions and their mitigation methods.