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The White House. Fact Sheet: President Biden Signs Executive Order Catalyzing America’s Clean Energy Economy Through Federal Sustainability. 2021; published online Dec 8. https://www.whitehouse.gov/briefing-room/statements-releases/2021/12/08/fact-sheet-president-biden-signs-execu-tive-order-catalyzing-americas-clean-en-ergy-economy-through-federal-sustaina-bility/.