While millennials care deeply for their planet, they don’t have a lot of money to invest. To encourage them to take out WWF memberships, Christoffer Fejerskov Boas & Klara Vilshammer created Pay Up Parents - a campaign that lets millennials invoice their parents according to how much they f*cked up. The campaign speaks to millennials’ frustrations with how their parents’ generation treated the planet, while creating an opportunity to build new WWF memberships.