Their signature program is the Living Building Challenge (LBC), the world’s most rigorous green building performance standard. The challenge calls for the creation of building projects at all scales (from single-room renovations to whole neighborhoods) that operate as cleanly, beautifully and efficiently as nature’s architecture. To achieve certification, a project must meet 20 rigorous imperatives (including net zero energy, water, and waste) over a minimum of 12 months…

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