Jeremy Rifkin nach einem Vortrag in Ravensburg
Andreas Pahl (<a href="//commons.wikimedia.org/w/index.php?title=User:Moovie&amp;action=edit&amp;redlink=1" class="new" title="User:Moovie (page does not exist)">Moovie</a>)
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>