Behind the Paper

Closing the phosphorus cycle by producing fertilizer from wastewater: what we know and what we need to go further

What happens when phosphorus, a key raw material for fertilizer production, becomes scarce, impacting global agriculture and food security? New research in *Reviews in Environmental Science and Bio/Technology* by C. Y. Sousa, I. Gomes, A. Amaro and A. Fernandes explore this pressing issue.