In almost one year since starting a container deposit scheme (also known as a "bottle bill" or deposit return system), residents of New South Wales, Australia, "have returned more than 900 million cans and bottles.
It is hoped the scheme will reduce litter by 40% by 2020... If we compare [litter from] September 2017 to September 2018, we went from an average of 20 containers per 1,000 metres down to around six." (via Reloop Platform)