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***Photos credits:***  
AWL Images, Courtesy of QGC/BG Group, Confab/VWS Brasil LTDA, Clover Images, Corbis, Design Pics, Digital Vision, E+, [Glowimages](http://www.veolia.matton.com/browse.php?publisher=GLO) , Godefroy/SNCF, Iconica, IStock/360, OEM Images, Photodisc, Photos.com/360, Kacper Kowalski, National Geographic, Moment, Royalty-Free/Corbis, Sodapix AG, Shin Takahashi, Iser, Stockbite, Stone,Tara Expéditions, Tetra Images, Jose Luis Stephens/Radius Images.

***Veolia photo library:***  
Salah Benacer, Samuel Bigot/Andia, Alexis Duclos, Philippe Eranian, Olivier Guerrin, Stéphane Lavoué, Eric Lefeuvre, Christophe Majani, d'Inguimbert, Jean-Philippe Mesguen, Manolo Mylonas, Jean-Marie Ramès, RMN-Grand Palais/Jean-Gilles Berizzi, Justin Sutcliff/Interlinks Image, Munem Wasif/Agence VU ; Veolia Foundation ; archives Dalkia ; archives Sedif

***Illustrations :***  
Idé