He served as the White House lead for the Trillion Trees Initiative, part of the Trillion Tree Campaign, which aims to conserve, restore, and grow a trillion trees around the world by 2030. President Trump signed an Executive Order "Establishing the One Trillion Trees Interagency Council" in October 2020. Liddell oversaw the Administration's contribution, and represented the White House during its engagements with 1t.org and the 1t.org Stakeholder Council.
