Let’s explain shortly the diagrams presented above. For many years, our economy has followed the linear model, where a product is made from raw materials, and then any waste is thrown away (e.g., packaging). In an economy based on recycling, materials are recycled and reused (e.g., waste-paper is recycled and then it is used to make new (recycled) paper). However, none of the above is really sustainable; in order to ensure sustainability, our economy should be circular. In such an economy, waste is prevented by using certain raw materials that make products more efficiently and reusing them, so it doesn’t affect our ecological system.