As the Senate debates clean-air legislation that would cut greenhouse gases by 66% by 2050, Sen. John Warner, R-Va., one of the bill's sponsors, is seeking to assure coal-producing states that the law "does not in any way try to damage coal." Warner said the president should have the ability to alter emissions caps if technology for carbon capture and storage is not commercially viable by the law's original deadlines. To jump-start that research, the bill would offer nearly $16 billion in public funding.

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