Benefits of online grocery shopping:
Online grocery shopping reduces environmental damage by reducing your carbon footprint. By ordering your grocery online, the amount of gas spent is significantly reduced because you don't need to drive your car to and from the grocery store. Although the food will be delivered to you with a large truck that will also use gas, you're cutting down on emissions and this helps the environment. The truck would deliver food to numerous households in your neighborhood so the gas used would be spent anyway. But if each of one of us takes the car to go to the super market, it will mean significantly more gas used. Instead, if each one of us cuts down on the amount of gas used, the environmental impact will be significantly reduced.
A unique advantage of online grocery shopping is that you go by the original shopping list avoiding the instant craving that normally influences shopping in a super market. As an online shopper you are less likely to be influenced by supermarket sales and offers and buy more than you need. In that sense, online grocery shopping reduces over-consumption and eventually reduces waste because people buy as much as they need and consume it all and buy again when they are out of supplies.