The Environmental Protection Agency advanced new rules in the president's fight against global warming on Friday, prohibiting chemicals that the agency says are contributing to climate change.

"Today's action delivers on the president's Climate Action Plan and the administration's commitment to acting on climate," said EPA Administrator Gina McCarthy.

She said the agency's prohibition on hydrofluorocarbons, or HFCs, a class of potent greenhouse gases used in air conditioning, refrigeration and other equipment, moves in step with actions the industry is already taking to phase out the harmful agents.

McCarthy said "leading businesses" are taking action "to reduce and replace HFCs with safer, climate-friendly alternatives."

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