The document summarizes Hong Kong's environmental levy scheme on plastic shopping bags which began on July 7, 2009. The scheme aims to encourage citizens to bring reusable bags by charging 50 cents for each plastic bag provided by prescribed retailers over 200 square meters or with 5 or more outlets. In the first two years, plastic bag usage decreased 27% while non-woven bag usage increased 96%, showing the scheme was effective at reducing plastic waste. However, issues around enforcement, evasion of fees, hygiene concerns and changing personal behaviors remain challenges. Recommendations to address these include recycling programs, stronger laws, incentives and more education.