Concord Monitor: Mascoma Corp. in Lebanon says it has moved ahead of the pack in creating a commercially viable way of making ethanol, announcing a “proof of concept” that cuts the company’s cost of production to less than half of last year’s. Last week’s announcement, which researchers called “a true breakthrough” toward achieving commercial ethanol production, keeps the company on track to build a full-scale ethanol plant by 2012. “This advance leads to more than 60 percent reduction in the …