How will we solve the world’s water wars? An ancient Spanish court offers one answer | Roman Krznaric

From Los Angeles to Cairo, the global water crisis is escalating - but Valencia's Tribunal de les Aigues could inspire a solution

Every Thursday at noon, outside the west door of Valencia's cathedral, nine black-cloaked figures - one wearing a banded cap and with a ceremonial harpoon by their side - gather for their weekly meeting, as they have done for hundreds of years. This is the Tribunal de les Aigues (Tribunal of Waters) - a water court that may be the oldest institution of justice in Europe.

It may seem like a relic of the past, but in fact, in the midst of a global water crisis, the tribunal is more relevant than ever. We are a civilisation at risk of committing aquacide. Due to droughts caused by climate change, expanding industrial agriculture and growing urbanisation, one in every four people will be affected by water scarcity over coming decades, with cities from Los Angeles and Cairo to Melbourne and Sao Paulo facing acute shortages. Water conflicts are on the rise, both within and between nations - we are increasingly fighting over water rather than oil and land. Moreover, in countries such as the UK, private water companies are jacking up prices and siphoning off super-profits while dumping sewage in the rivers.