What is the key concept for this section? In order, what are the four levels of more sustainable resource use? How has cradle-to-cradle design elevated reuse to a new level? What are two ways in which...

What is the key concept for this section? In order, what are the four levels of more sustainable resource use? How has cradle-to-cradle design elevated reuse to a new level? What are two ways in which governments can encourage reuse? Give two examples of shared use.