Music superstars Beyonce and Jay-Z are offering fans a chance to win free tickets for life to their concerts in exchange for adopting a vegan diet for a month.
A study in the journal Science last June concluded that avoiding meat and dairy products would be the biggest way to reduce the environmental impact on the planet because of reduced irrigation of farmland, animal emissions, food processing and transport.
Under the contest rules, one fan will get a pair of tickets to one official concert tour by Beyonce and/or Jay-Z for the next 30 years.
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