After leaving politics, McKenna founded the Climate and Nature Solutions advisory firm, became a visiting fellow at Columbia University, and served as the chair of the United Nations High-Level Expert Group on the Net-Zero Emissions Commitments of Non-State Entities.[1][3][4] After graduating from École élémentaire catholique Notre-Dame (her father insisted that all his children be bilingual despite not knowing any French himself),[1] McKenna attended Saint Mary Catholic Secondary School.[3] Between 1996 and 1999, McKenna studied law at McGill University before beginning her legal career in Jakarta, Indonesia at the firm, SSEK where she focused on international trade, investment and constitutional issues.[11] She also led efforts to phase out coal, reduce plastics in oceans and waterways, and doubled the amount of nature protected in Canada in partnership with Indigenous Peoples.[11][18] Conservative MP Gerry Ritz caused controversy in September 2017 when he tweeted a link to a news story stating no industrialized nations were on pace to meet Paris Agreement carbon emission targets with the comment "Has anyone told our climate Barbie![21] In May 2018, the Trudeau government's decision to buy the Trans Mountain pipeline for $4.5 billion was criticized by environmental activists as contrary to its climate change plans.[27][28] Following the 2021 federal election, she was succeeded as MP by Yasir Naqvi, a Liberal who served as the attorney general of Ontario in the provincial government of Kathleen Wynne.