Thanks for posting this, @martintorres, and thanks for your comments, @will.nash. You raise some important points, but I think you’re relying on an incorrect premise that carbonation automatically leads to accelerated deterioration of concrete structures. While it is true that carbonation can lead to durability issues in structures with reinforcing steel, proper design can easily avoid this and there is extensive evidence to support this. We are not saying that quantifying carbonation in concrete is a way to avoid talking about other kinds of emissions and proper design, which is why we always include those in our analyses. Indeed, we are skeptical of other published carbonation estimates that have used a top-down approach, which is why we have used a different approach that we think is more representative of actual carbonation. We simply think it is important to track both carbon that is emitted and sequestered in all building materials in the most accurate way possible, and that can certainly include approaches that deal with time value of carbon. We’d be glad to discuss this more with you so that we can clarify any misconceptions you may have. Please reach out if you’re interested.