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Methane is a clean fuel that can be generated from renewable sources such as organic waste.Yet methane is also a potent greenhouse gas contributing to climate change.Methane can be produced in both natural and engineered systems via methanogenesis as an exclusively microbial process,which requires interactions between diverse populations of bacteria and archaea.While progress has been made to profiling the microbial community composition in methanogenesis,it remains a challenge to understand the interactions between microbial populations,which is critical for developing strategies for the control of methanogenic waste treatment processes.Dr.He will provide examples of these interactions interpreted from the linkages between population dynamics and process performance in methanogenic wastewater treatment processes.