By Jarrett Renshaw and Ernest Scheyder WASHINGTON (Reuters) -U.S. President Donald Trump on Friday reversed a Biden-era air pollution rule that had imposed stricter limits on emissions from copper smelters. The copper rule, finalized in May 2024, had required smelters to curb pollutants including lead, arsenic, mercury, benzene and dioxins under updated federal air standards. Trump's proclamation grants a two-year exemption from compliance for affected stationary sources, which the White House said would help promote American mineral security by reducing regulatory burdens on domestic copper producers. "Imposing these requirements on such a limited and already strained domestic industry risks accelerating further closures, weakening the Nation’s industrial base, undermining mineral indepen

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