New CementMaking Method Could Slash Carbon Emissions

The proof-of-concept device concentrates sunlight to break apart limestone.

Researchers at George Washington University have bolted together an ungainly contraption that they say efficiently uses the energy in sunlight to power a novel chemical process to make lime, the key ingredient in cement, without emitting carbon dioxide. The device puts to work about half of the energy in sunlight (solar panels, in comparison, convert just 15 percent of th

Source:
http://www.technologyreview.com/energy/40398/