Cob: Origins of Cement vs Cob

[Unleesh at aol.com]

Wayne,

thank you for the reality check, but on the other hand, i don't think you 
addressed the environmental impact of concrete. If it gases off radon, if it 
incorporates toxic materials into its mix, if it requires heat which is 
disruptive to the environment, it doesn't sound worth it to me.

(un)leash