Which of these innovative sustainable materials has been praised for its carbon-negative properties and is increasingly specified in modern architectural designs for structural elements?

In the evolving world of architectural design, sustainability has become a cornerstone principle. Modern architects are increasingly challenged to select materials that not only meet aesthetic and functional requirements but also minimize environmental impact throughout the building's lifecycle. This trivia question explores an innovative sustainable material that's transforming how architects approach product selection and building design. Test your knowledge of cutting-edge sustainable materials in contemporary architecture!

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Mass timber (specifically cross-laminated timber)
Recycled aluminum composite panels
Graphene-reinforced concrete
Self-healing bioplastic cladding