What are the motifs in Cradle to Cradle by William McDonough?

Common wisdom today says that we are depleting and polluting the earth when we use things. There is a general feeling of guilt associated with this, because we are polluting the waterways, eating up all the fish, poisoning the earth with our agriculture, using up all the fossil fuels, and burdening the land with our immense waste. In some ways, this is true, because we utilize design and manufacturing principles that are negative. However, this book suggests that we can enjoy abundance in our lives and at the same time, build and replenish the earth. We do this by choosing materials and methods that we know to be safe and healthful, not just to people but also to the earth itself.