Calling for clarity

Calls for carbon trading in the US are growing ever louder, and not just from legislators and green groups. Firms such as Calpine, Entergy, Exelon, FPL, Pacific Gas & Electric and Public Service Enterprise Group recently made public their support for a cap-and-trade plan proposed by Democrat senators Dianne Feinstein (California), and Thomas Carper (Delaware) which would force the US power sector to submit to nationwide emissions caps that would tighten over time.

"As the single largest sourc