Decisions that are made at the design stage influence how we make and use things. Once those decisions have been made, they're hard to reverse. Take ocean plastic. Unfortunately, the more we understand, the more it seems unimaginable that we could ever extract all the plastic that's reached the ocean already. These are challenges at different scales, admittedly, but it's completely feasible to imagine a packaging model, business model, that never leaks plastic into the ocean. That's why design is so important. In terms of the actual principles, it’s important to avoid going straight to certain strategies. With the circular economy, often you hear about repair or remanufacturing, or renting a product rather than selling it, or recycling, or smarter materials choices. Those all might be the answer, but the method that you might apply for a bicycle that's designed for shared use versus a piece of packaging for some crisps, or a house, they're going to be different strategies.