Among the world leaders, Arnold Schwarzenegger takes to the podium.
While speaking at the opening ceremony, Austrian President Alexander Van der Bellen invites the former actor and Governor of California to join him to "give a bit of a pep talk."
Schwarzenegger stresses the importance of local leaders in the US in fighting climate change.
Everytime you talk about America, you’re right when you say that our leadership in Washington is a little bit backwards. But you’re wrong when you say that America dropped out of the Paris agreement.
Because if you look a little bit beyond Washington you will see that it is the states and the cities, it's local governments, that can draw 70% of our emissions. And you will see all the extraordinary work that is going on a state and city level in America."