What is produced by microbes decomposing matter in landfills and swamps?

Microbes decomposing organic matter in landfills and swamps produce biogas, primarily composed of methane and carbon dioxide. This process, known as anaerobic digestion, occurs in environments with low oxygen levels. The decomposition also results in nutrient-rich organic material, contributing to soil health when the matter is eventually released or processed. Overall, these microbial activities play a crucial role in nutrient cycling and waste management.