In his book Concrete Planet, author Robert Courland discusses why the concrete first used by the Romans is more durable than the concrete used in most present day buildings. Plus, mineralogist Peter Stemmerman tells us about his invention, Celitement and why it is greener than Portland cement.
Republican leaders in Virginia say Obama's clean energy plan would drive up energy costs and damage a struggling economy. Democrats say saving the planet is more important than the short-term problem of higher energy bills.
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