There are other products that are on the market as well. I want to get a sense of how your organization establishes metrics so that they can be used in government procurement to determine whether greenhouse gas reduction goals are going to be met with any given material.
With respect to some new concretes and cements that are being made, I know that there were a bunch of patents in the early 2000s around using flue gas to create the calcium carbonate. Those were actually carbon-negative products, because they're removing flue gas that would otherwise go into the atmosphere. Those are going to be out of patent pretty soon.
Do you have metrics that would be available for government to use with respect to those materials?