We could probably get back to you with additional details, but in our consultations with the Cement Association, this is not something that has come up. I have a university friend who works for the Cement Association. We have lots of discussions about the industry and environmental impacts and their efforts to improve their environmental performance. My understanding from him is that there are a number of alternatives to fly ash and that cement is produced around the world, including in jurisdictions where there is no coal and where they use alternatives to fly ash.
On November 8th, 2018. See this statement in context.