Volunteers comb the dried-out Danube riverbed looking for new finds near the village of Ryahovo on August 21, 2026, after a record low water level revealed mammoth bones there at the end of July. As a drought scorching Europe has caused river levels to drop to record lows, a group of volunteers is scanning the dried-up Danube bank in northern Bulgaria, not far from where the receding waters lay bare mammoth bones last month. The drought in Europe has been exacerbated by human-induced climate change, according to experts, who warn that the problem will worsen. The low river levels have strained shipping and forced nuclear power plants cooled by water from rivers to shut or reduce their output. (Photo by Nikolay DOYCHINOV / AFP via Getty Images)