https://www.scientificamerican.com/article/bidens-first-climate-actions-include-rejoining-paris-agreement/ > Joe Biden will spend his first hours as president trying to obliterate much of the Trump administration’s deregulatory agenda, restore public land protections and reestablish the United States as a global leader on climate change policy. > Biden will sit in the Oval Office later today and sign a sweeping executive order to rejoin the Paris Agreement and undo President Trump’s rollback of greenhouse gas policies, said Gina McCarthy, Biden’s national climate adviser.