The marginal cost of mercury reductions by 2015 ranges from $350 million/ton to $432 million/ton, again depending on the scenario.
By 2015, mercury reduction's marginal cost is between $350 million a ton to $432 million a ton.
The marginal cost associated with mercury reduction had a range of $300 million a ton to $350 million a ton.
The storm hit Pheonix
Two girls are walking together on the ice.
A man is playing with a ball.
They put plaster walls up without tinting it.
Kids are coming out having learned things very quickly, but it's not clear that they learned it properly.
An old man sleeps on the sofa.