In this April 23, 2021, file photo National Climate adviser Gina McCarthy waits for the arrival of President Joe Biden to speak to the virtual Leaders Summit on Climate, from the East Room of the White House in Washington. In the first Biden administration rule aimed at combating climate change, the Environmental Protection Agency is proposing to phase down production and use of hydrofluorocarbons, highly potent greenhouse gases commonly used in refrigerators and air conditioners. (AP Photo/Evan Vucci, File)
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