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The article reports that the U.S. Supreme Court will hear disputes on two key environmental cases and a lawsuit over punitive damages against a company. The Court will decide whether the U.S. Environmental Protection Agency has the authority to regulate carbon dioxide, a greenhouse gas. On the other hand, a second Clean Air Act case is about the increasing annual emissions of Duke Energy Corp.

The article reports that the U.S. Supreme Court will review the Court of Appeal decision on the lawsuit filed by 12 states against the Environmental Protection Agency on regulating carbon dioxide emissions from motor vehicles. The court will be resolving whether the Clean Air Act compels the agency to regulate it as a pollutant to public health and welfare. This case is important to the states that have enacted laws that limit the emissions from vehicles in 2009.