Which unique requirement does the Living Building Challenge mandate that distinguishes it from other green building certifications like LEED?

The architectural industry has been at the forefront of sustainability initiatives in recent years. Among various certification programs, the Living Building Challenge stands as one of the most rigorous performance standards for buildings. This poll tests your knowledge about this pioneering sustainability framework that's reshaping how architects approach environmentally responsible design.

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Net-positive water usage (buildings must generate more water than they consume)
Net-zero energy performance must be proven through 12 consecutive months of operation before certification
Building materials must be sourced from within a 100-mile radius exclusively
All buildings must incorporate living walls covering at least 30% of exterior surfaces