Today’s Solutions: December 16, 2025

How would the circular economy actually work in practice? To find out, all we have to do is look within an abandoned indoor waterpark that sits on the banks of the river Maas in Rotterdam.

Yes, a derelict swimming pool may seem like a strange place to see the circular economy in action, but the old waterpark, formally known as Tropicana, has been taken over by 30 businesses that all share resources and reuse the waste in a trial “circular economy”. They call it BlueCity. Tropicana had fallen into disuse in 2012, but to entrepreneur Siemen Cox, the structure of the building looked like a giant greenhouse—which was perfect for Cox, who was looking for a site to grow mushrooms using coffee grounds.

Cox was able to convince investors and city officials that the old Tropicana could become an ecosystem of circular entrepreneurs, and well, the rest is history. Beneath the pool are craft brewers Vet & Lazy who are developing a pioneering chemical-free rainwater purification system, and the circular caterer Arabella van Aartrijk, who bakes cookies from Vet & Lazy’s spent grain and rescues “ugly” food. In other parts of BlueCity, old mangoes are mashed into leather and used plastic is 3D-printed into new products.

Want to see for yourself what the circular economy could like? If so, look no further.

Solutions News Source Print this article
More of Today's Solutions

Vision board ideas for adults: how to create one that inspires real change

BY THE OPTIMIST DAILY EDITORIAL TEAM A vision board might look like a crafty throwback to childhood afternoons spent collaging. But don’t write it ...

Read More

India’s social experiment: how paying women directly reshapes welfare, autono...

BY THE OPTIMIST DAILY EDITORIAL TEAM Across India, millions of women now receive a modest but unwavering deposit each month into their bank accounts. ...

Read More

New Zealand’s groundbreaking shift to renewables promises massive emiss...

New Zealand launched its most ambitious emissions reduction initiative to date in an incredible undertaking. The government announced a historic switch from coal to ...

Read More

Going for the goal: the impact of team sports on boosting young girls’ ...

In a pioneering study, the Here for Every Goal report demonstrates that team sports, particularly elite women's soccer (referenced from here on in this ...

Read More