Durability and sustainability go a lot further than just quality or just using ecological materials. It should be a philosophy that is implimented in every step of the design and production process.
Superior quality for maximum lifespan Optimal use of materials Local materials and production Small transport volume Energy minimazation in the production process Ecological packaging ... If all steps are well considered the footprint and in most cases the cost of a product can be drastically reduced.
The biggest challenge however is to create aesthetic and emotional durability. Only then people will hold on to their products and timeless design is created.