PCI has conducted comparative LCAs, and I can tell you that there are many details that must be studied for an application like this. How much energy and environmental impact would be associated with coating and periodically re-coating a steel tower over its lifetime to prevent corrosion? How much fabrication energy would be used simply to introduce the helical twist in the steel tower? What about using concrete made with little or no Portland cement (a main source of concrete’s energy and CO2 impact)?

I suggest that builders of such towers consult with competent representatives of the steel and concrete engineering communities who have performed the appropriate LCA studies, and not rely only on the opinion of RAFAA, in deciding which option to use.