Don’t blame climate change for the Himalayan flash flood

The tragic and terrifying Himalayan flash flood was caused by a chunk of mountain collapsing into a narrow gorge, sending a tsunami of mud and rock that gathered mass as it shot down the steep Trisuli river valley. More than that is not yet clear. Did a breakaway hanging glacier take a rock face with it or was it the other way round? Was there time for the debris to dam the valley and form a lake that burst or did the 60-metre flood of mud come from ice, river water, rock and soil that accumulated in the valley as...