Concrete = 5% of Global Carbon Footprint (NPR)

On NPR, May 22nd, 2009

Concrete may be responsible for as much as five percent of the global carbon footprint, taking into account the energy required to make it and the CO2 emitted by the kilning process. But a new study by engineer Liv Haselbach finds that concrete may also be an important CO2 sink.

Listen to the show here.