 NEW YORK, Sept. 23, 2021 PRNewswire -- Sigma Lithium NASDAQ: SGML, a company dedicated to powering the next generation of electric vehicle batteries with environmentally sustainable and high-purity lithium concentrate, announced today that Ana Cabral Gardner, Sigma Lithium Co-CEO, will be participating at the High-Level Dialogue on Energy to be held virtually at the summit level on September 24, 2021 at United Nations Headquarters in New York. 