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U.S. President Joe Biden (C, Front) signs an executive order during an event on clean cars and trucks on the South Lawn of the White House in Washington, D.C., the United States, on Aug. 5, 2021. Joe Biden Thursday signed an executive order calling for half of new vehicles sold in U.S. by 2030 to be zero-emission. (Photo by Ting Shen/Xinhua)