In countries such as Australia and the UK, supermarkets no longer provide single-use plastic shopping bags. Consumers need to either bring their own reusable shopping bags when grocery shopping, or purchase one at the supermarket. However, in countries such as Singapore, single-use plastic shopping bags are still commonplace. You have been hired as a marketing consultant by a large supermarket chain in Singapore to help them develop a marketing strategy to introduce a similar initiative amongst Singaporean shoppers and phase out the use of single-use plastic shopping bags. Use the Theory of Planned Behaviour to explain how you might facilitate the transition of Singaporean shoppers' behaviour from using single-use plastic bags, to using their own reusable shopping bags.