Danube river

From the Danube to the Loire, Europe’s prime rivers — lifelines for the continent’s economy — are running low after a brutal five-month drought. After years of dry weather, scientists are warning that low-water conditions could become the norm in Europe as the climate changes.

Once, a river ran through it. Now, white dust and thousands of dead fish cover the wide trench that winds amid rows of trees in France’s Burgundy region in what was the Tille River in the village of Lux.