Spain’s Catalonia region is experiencing extreme drought. The Sau reservoir, 100km (about 62 miles) inland from Barcelona, has in recent months become a visible symbol of the situation. That is because of the sight of the 11th Century church of Sant Romà de Sau, which was submerged when the reservoir was created in 1962. This part of Catalonia has not seen sustained rain in two-and-a-half years. In early March, the reservoir’s water level had dropped to 8% of its capacity.