The measure represents the latest in a series of Republican concessions on spending and debt issues, with House Speaker John Boehner, R-Ohio, and his leadership team proposing the debt ceiling increase without any spending cuts they had previously demanded to offset the cost.

CNN: January 23, 2013 -- Updated 1714 GMT (0114 HKT)

One such emerging tool is the voluntary carbon emission market, a place where corporations voluntarily buy emission credits to offset their own carbon emissions without regard for any requirement like a carbon cap.

FORBES: BY DENNIS POSADAS