anchor: Using Scenario D as an example, the remaining allowances in 2015 are 100 million metric tons for carbon, 1.3 million tons for SO2, 0.2 million tons for NOx and 25 tons for mercury.
positive: In 2015, the allowance remaining for carbon exceeded 90 million metric tons.
negative: The remaining allowances in 2000 are 50 million metric tons for iron.