Recently, nutritionist Marco Borges published a new cookbook titled The Greenprint: Plant-Based Diet, Best Body, Better World, for which Beyoncé and JAY-Z wrote the introduction. The three have promoted the benefits of plant-based diets together for a few years now, and today, Beyoncé announced a new initiative for fans to go vegan. By pledging commitment to a more plant-based lifestyle (be it part time or not), fans can enter to win Beyoncé and JAY-Z concert tickets for life...or, at least, one per tour for the next 30 years. Which still sounds pretty incredible. Check out all the contest details here.