He outlined what he would do as president to combat climate change.
Through a series of executive actions and legislation presented to Congress, O'Rourke's plan calls for $5 trillion to update aging infrastructure and accelerate innovation among other things.
He guarantees the plan will allow the U.S. to achieve net-zero emissions by 2050, and be halfway there by 2030.
The announcement marks O'Rourke's first major policy plan since launching his campaign for president last month.