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'We used to think of health as a diet - some worked for us, some didn't.

Go vegan! Yes, if you would like to see every single Beyoncé and Jay-Z concert from now until, well who knows who will outlive who, but you get the idea. The interactive website demonstrates the impact of eating plant-based meals on the environment from absorbing harmful emissions, to cleaner water to the conservation of power.

This challenge can be a starting point and may be the nudge some people need to give plant-based eating a try.

Sharing details of the once in a lifetime competition on her Instagram page, Beyonce posted: "What is your Greenprint?".

Since then they have been encouraging others to join the green revolution and partnered with their personal trainer, Marco Borges, who introduced them to a vegan diet, to create 22 Days Nutrition.

Beyoncé said her Greenprints are "plant based for breakfast" and "meatless Mondays".

Fans can submit how many of their meals are plant-based and in return, get the chance to win 30 years worth of tickets.

Seeing either Beyoncé or Jay-Z live at some point throughout life is something that a lot of people might wish to tick off their bucket lists. "Click the link in my bio for a chance to win tickets to any JAY and/or my shows for life".

"Having children has changed our lives more than anything else", Bey and Jay wrote in the book's blurb, according to an excerpt in People.

"Our Greenprint is the positive impact we can have on the world by eating plant-based meals", the site explains, before delving into some of the positive global effects of following a vegan diet.