Which sustainability certification system, first launched in 1990, revolutionized green building standards and is now the most widely used green building rating system worldwide?

The architecture industry has been at the forefront of sustainability initiatives in recent decades. From green building certifications to innovative materials that reduce environmental impact, architects have pioneered many approaches to creating more eco-friendly structures. This trivia question focuses on a significant milestone in sustainable architecture's development that changed how the industry approaches environmental responsibility.

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LEED (Leadership in Energy and Environmental Design)
BREEAM (Building Research Establishment Environmental Assessment Method)
Passive House (Passivhaus) Standard
Living Building Challenge