<http://schema.org/url>
<http://s1.lemde.fr/image/2012/12/21/696x348/1809358_3_2d59_un-forage-de-gaz-de-schiste-en-pennsylvanie-en_49c5fe23f2988b894ec6ee62cf5c9a92.jpg>
<http://www.lemonde.fr/planete/article/2013/01/04/gaz-de-schiste-des-fuites-de-methane-plus-importantes-que-prevu_1812943_3244.html>