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Few would argue that the City of Toronto’s goal of reducing building-related carbon emissions to zero by around 2030 is a worthy, though challenging, goal. Built form, after all, accounts for about 40% of all greenhouse gases. But how do we know when a building has actually stopped emitting carbon? And what does net zero really mean? In a jurisdiction with relatively clean electricity, one answer seems straightforward enough: heat only with electrons; don’t build in a field in the middle of nowhere; use construction materials that sequester instead of consume carbon. But we don’t live in a simple world, so the political economy around green building policies is a bewildering maze of acronyms, competing certification protocols, and sly gaming strategies, all set against the technically daunting backdrop of building science and building codes. LEED, PHI, PHIUS, TEDI, TEUI, GHGI, TGS. The list goes on, making it nearly impossible for a lay person to determine whether the city is

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