Which of these sustainable building products was first developed by architect William McDonough and chemist Michael Braungart as part of their 'Cradle to Cradle' design philosophy?

Sustainability has become a cornerstone of modern architectural practice, with certain products revolutionizing how architects approach environmentally responsible design. Beyond just energy efficiency, these innovations have transformed entire building systems and created new paradigms for construction. Test your knowledge of groundbreaking sustainable products that have shaped contemporary architecture and continue to influence the industry's approach to ecological responsibility.

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Declare Label - the 'nutrition label' for building products
Breathe Wall - the air-purifying interior panel system
Climatex Lifecycle - the compostable upholstery fabric
Bios Urn - the biodegradable planter system for buildings