In 2023, Australia put a 330-square-metre floating wetland on a wastewater lagoon; two years later researchers found methane emissions had fallen by up to 66%

• Floating wetlands slash wastewater greenhouse gas emissionsInstalling a floating wetland planted with native vegetation on an Australian municipal wastewater lagoon cut methane emissions by up to 66 per cent, according to the results of a two-year field trial.
• Published on 25 August 2026 in the Journal of Environmental Management, the peer-reviewed study looked at how constructed floating wetlands affect greenhouse gas emissions from open water storage.
• The trial was carried out at a Westernport Water treatment facility on Phillip Island, Victoria, by researchers from RMIT University, Australi