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The US Environmental Protection Agency was set to shift course and deem carbon dioxide a health risk on Friday, sources said, in a turnabout important to global warming-related regulation.
Five out of nine Supreme Court justices ruled in April 2007 that carbon dioxide was a pollutant under the Clean Air Act.
They ordered the EPA to decide if the greenhouse gas endangered public health and welfare and said that if a so-called endangerment finding was made, the agency must draft rules to reduce vehicle emissions of carbon dioxide.
In December 2007, the EPA sent a draft finding to the Bush White House, presenting evidence that CO2 did endanger public welfare.
But the administration of president George W. Bush failed to acknowledge the report and spent the remainder of its tenure resisting the Supreme Court decision.
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