Methane emissions from wetlands can be reduced by creating marshes with intermittent flooding and dry periods. In a study simulating floodplains in the Midwestern USA, marshes with intermittent flooding emitted less methane than permanently flooded areas. Both marshes with and without plants emitted similar amounts of methane during the growing season, but less than permanently flooded areas. This suggests that incorporating seasonal floods and dry periods in created wetlands can help lower methane emissions.