Northeast Carbon Trading System Gets Under Way - Green Inc. Blog - NYTimes.com

At the moment, the oversupply of allowances has caused the price of carbon to drop. Carbon futures dipped below $4 a ton of carbon dioxide on Thursday, according to Evolution Markets, a carbon brokerage. That was down by about half over the past several months, though trading volume has picked up significantly in the run-up to R.G.G.I.