A fundamental principle of sustainable design is certainly the reduction in the use of raw materials (in favour of recycled materials) and disassembly.
The less raw materials are used in the production of an object, the less energy is required for its manufacturing process.
In the design phase, it will be crucial to design objects that can be easily disassembled at the end of their life, so that they can be disposed of.
Facilitating separate disposal will also facilitate the recycling of materials that will be put back into circulation to create new products, avoiding the consumption of raw materials that are not infinite.
This approach also results in a lower environmental impact and a smaller carbon footprint.