Tell us what it did.

Gathering the stories.

• For the 2000 world's fair, the city asked Bill to write design principles for a new millennium. The result began: insist on the rights of humanity and nature to co-exist. The Hannover Principles became a founding text for sustainable design, and the ground the book would grow from.

  City of Hannover

  The Hannover Principles, Hannover, Germany

• A small Swiss mill asked what a fabric designed for the biological cycle would be. Working with Bill and Michael Braungart, they screened thousands of chemicals down to a safe few dozen and made an upholstery fabric whose trimmings could go straight to the compost. The water leaving the factory tested as clean as the water coming in.

  Rohner Textil

  Climatex fabric, Gais, Switzerland

• A furniture factory designed with Bill's firm around daylight, fresh air, and a landscape of native plants. Workers stayed, and so did the design lesson: a building can be a good neighbor to the meadow around it. It set the stage for the chairs that followed.

  Herman Miller

  The GreenHouse factory, Holland, Michigan

• A corporate campus designed with Bill's firm under a living roof of native grasses, restoring the hillside it stood on instead of paving it. The roof was planted with species from the surrounding landscape, so the building gave habitat back.

  Gap, Inc.

  901 Cherry campus, San Bruno, California

• As dean of the University of Virginia's School of Architecture through the 1990s, Bill put the Hannover Principles into the studio. A generation of students learned to ask, from the first sketch, what a building is made of and what it will become.

  Design students at UVA

  School of Architecture, Charlottesville, Virginia

• An environmental studies building designed with Bill's firm to make more energy than it uses, with solar on the roof and a living machine that cleans its own wastewater with plants. It became one of the first buildings in the country to export power back to the grid.

  Oberlin College

  Adam Joseph Lewis Center, Oberlin, Ohio

• Within a few years of its publication, the Hannover Principles was being taught in design schools and quoted in studios around the world. Nine short principles gave teachers a way to ask the largest questions in the simplest language.

  Teachers of the Principles

  The Hannover Principles in class, Worldwide

• In the late 1990s, one of Europe's largest clothing retailers explored apparel designed to return safely to the soil, working with the ideas that became the book. A t-shirt that could be composted asked a question the industry is still answering.

  C&A and the compostable wardrobe

  Clothing for the biological cycle, Europe

• A ten-acre living roof went on top of the Rouge truck plant, designed with Bill and his team. The roof holds stormwater, cools the building, and turned a factory that had stood for a century into a place where birds nest. It is still growing.

  Ford Motor Company

  Rouge Center, Dearborn, Michigan

• A carpet tile designed as a technical nutrient: when it wears out, the company takes it back and makes it into new carpet, again and again. The material never becomes waste. It became one of the first Cradle to Cradle certified products.

  Shaw Industries

  EcoWorx carpet tile, Georgia

• A chair designed so its parts come apart and each material goes back to its own cycle, biological or technical. The design team used the book's questions to ask what every ingredient was and where it would go next.

  Herman Miller

  Mirra chair, Michigan

• In northeastern China, a village worked with Bill's team on new homes designed around local materials, biogas from agricultural waste, and rooftops ready for solar. The question traveled from a world's fair in Germany to a farming village: how can a community thrive on its own income of energy and materials?

  The village of Huangbaiyu

  A rural eco-village, Liaoning, China

• The book was translated into language after language, and the cherry tree began appearing in boardrooms, ministries, and design reviews far from where it was written. A question printed on waterproof synthetic paper turned out to travel well.

  Readers around the world

  The book in translation, Worldwide

• Within a few years of publication, the book was assigned in architecture, design, engineering, and business programs. Students who grew up recycling everything were given a different question: what if things were designed so there was nothing to throw away?

  A generation of design students

  The book on the syllabus, Worldwide

• The certification that began with a handful of products grew into a standard used by hundreds of companies across building materials, clothing, packaging, and cleaning products. In 2012 it was given to an independent institute so the standard could belong to everyone.

  Cradle to Cradle Certified

  Products program, Worldwide

• Designers and mills began building a shared library of materials verified safe for the biological and technical cycles, so a dress or a shoe could be designed for its next use from the first sketch.

  Fashion Positive

  Circular materials for fashion, Worldwide

• The cherry tree from the first chapter became a lesson plan: a tree makes more blossoms than it needs, and nothing is wasted. Students redesign packaging, products, and sometimes their whole school using the same question. How can we be of good use?

  Teachers everywhere

  The cherry tree, in class, Worldwide

• In 2015 the European Union adopted its first Circular Economy Action Plan, and the words the book had carried, cycles, nutrients, design for reuse, began appearing in law. What started as a design question became public policy for half a billion people.

  The European Union

  Circular Economy Action Plan, Brussels

• To earn the certification's highest levels, products must be made with renewable energy and clean water. Hundreds of factories shifted toward solar and wind not because a law required it, but because a design standard asked what good manufacturing looks like.

  Companies chasing clean power

  The energy requirement, Worldwide

• A company grew packaging from mycelium, the root structure of mushrooms, binding agricultural leftovers into forms that protect products in shipping and then compost back into the soil. The biological nutrient cycle, grown rather than manufactured.

  Ecovative

  Mushroom packaging, New York

• The standard now covers thousands of products, from building materials to apparel to cleaning supplies, with requirements that keep rising: safer chemistry, renewable energy, clean water, fairness. What began as five questions in a book is now a working test applied in factories on every continent.

  Thousands of products

  Cradle to Cradle Certified, version 4, Worldwide

• In 2024 Europe extended ecodesign rules to nearly all physical goods, asking products to be durable, repairable, and recyclable by design. The book's oldest question, what is this made of and where does it go next, is becoming a condition of selling things at all.

  The European Union

  Ecodesign for Sustainable Products, Brussels

• The book's question, how do we live on current solar income, now turns to the heat beneath our feet. The Institute is convening the people who can make geothermal a working answer for the places that need power most, starting where the world's largest data centers meet unsurveyed ground.

  The McDonough Institute

  Geothermal Possibility, Virginia and beyond