The Obama administration's decision to raise the estimated price of carbon dioxide emissions from $21 a ton to $36 a ton, in 2007 dollars, has drawn criticism from Congress and some experts, according to this article. House lawmakers said the number was calculated without transparency, leading the chamber to pass a measure that prohibits its use. Critics say this could lead to tighter regulations on pollution, without certainty that the models used to calculate the amount are accurate.

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