This summer, festival-goers' urine is getting a second act as the secret ingredient in environmentally friendly beer, courtesy of climate scientists determined to make brewing even weirder. When science meets porta-potty, you know sustainability has gone full circle—cheers to the planet and questionable IPAs!

In 2015, Denmark's Roskilde Festival launched the "From Piss to Pilsner" initiative, collecting 54,000 liters of festival-goers' urine to fertilize barley fields. By 2017, this barley yielded "Pisner," a beer brewed by Nørrebro Bryghus, closing the loop from festival pee to eco-friendly pint. ([stateofgreen.com](https://stateofgreen.com/en/news/from-piss-to-pilsner-introducing-the-pisner-beer/?utm_source=openai))