Sustainable design in the United States is for many a sort of Rorschach test. The construction industry is either making steady progress toward the ultimate goal of a carbon-free building sector, or it’s moving entirely too slowly, missing key targets as the ecological clock keeps ticking. The perplexing truth to all of this is: both are ostensibly true. In recent decades the industry has become significantly more energy efficient. We’ve added building stock but flattened the energy curve. The cost of renewables continues to drop. But way more is required, much more quickly. At the same time, huge hurdles remain. Without a renewable grid and stringent energy codes, it’s hard to see how we can fully decarbonize the building sector in even 20 years, let alone at the timeline suggested by increasingly worried climate scientists. It’s the classic good news/bad news scenario (or vice-versa, depending on your mood).