Former governor of California and actor Arnold Schwarzenegger opens the Austrian World Summit, an environmental summit held in Vienna. Schwarzenegger, who is also the founder of the conference, was joined on stage by Austrian President Alexander Van der Bellen. "They say this is an existential threat, the world is coming to an end, we're running out of time, we need clean energy, but you can't use safe nuclear power, and you can't get permits for wind and solar or hydro. This is what's going on," says Schwarzenegger. IMAGES AND SOUNDBITES