Hey Gabi,
take a look at our 2016 topic (and programme) here
As soon as your Question is online, I will put a link to our page about the Budapest Challenge also 
Do you want to have a video chat with @Sophia about the creation of a collective eco-brand?
I would suggest you follow the Nemona Challenge here in Berlin (see programme link), they want to create a similar thing (but not worldwide)! Their username is @Nemona.