Termite Mounds (IMAGE) Proceedings of the National Academy of Sciences Caption These are termite mounds in a North Australian tropical savanna landscape during the wet season. Termite colonies can be significant sources of methane to the atmosphere, but their mounds act as efficient biofilters to intercept substantial amounts of greenhouse gas before emission. Credit Image courtesy of Philipp A. Nauer. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.