One of the largest producers of excess carbon dioxide — the cement industry — might get a green facelift in the next few years.

It is estimated that manufacturing conventional cement creates about 5 percent of global CO2 emissions (even more than the airline industry) by heating limestone and other ingredients to super-high temperatures. Some new cement companies are looking to change the process significantly and either lower or counter their CO2 production.

This article appears in Aug 12-18, 2009.