As the world gets hotter, climate activists are turning up the heat on ExxonMobil, the big oil giant they say bears responsibility not only for the ever-worsening climate crisis, but for perpetuating the “most consequential lie in human history.”

Amid a growing push for the corporation to be held accountable for its climate crimes, a coalition of activists was in Washington, D.C. on Thursday to deliver 360,000 petitions demanding a Department of Justice probe into what ExxonMobil knew about global warming—and how far it went to cover up its role in the phenomenon.