You  can start a worldwide petition online at: http://www.petitiononline.com/petition.html  

www.PetitionOnline.com   provides free online hosting of public petitions for responsible public advocacy. "We give you the ancient methods of grassroots democracy, combined with the latest digital networked communications, running live and free 24 hours a day."

A way to take action on what is happening around us is on the The Environmental Defense Action Network : http://actionnetwork.org/campaign/antibiotics2/actionalerts