Which of these innovative building materials was first launched to market in 2009, revolutionizing sustainable architecture with its carbon-negative properties?

In 2009, a revolutionary building material was launched that transformed sustainable architecture practices worldwide. This product dramatically reduced the carbon footprint of buildings while maintaining structural integrity. It quickly became adopted by major architectural firms for high-profile green building projects and has since become a standard in environmentally conscious design.

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Cross-Laminated Timber (CLT)
Self-healing concrete
Transparent aluminum
Graphene-infused steel