Had the formidable white arc of the Hoover Dam never held back the Colorado River, the US west would probably have no Los Angeles or Las Vegas as we know them today. No sprawling food bowl of wheat, alfalfa and corn. No dreams of relocating to live in a tamed desert. The river, and dam, made the west; now the climate crisis threatens to break it.

The situation here is emblematic of a planet slowly, inexorably overheating. And the catastrophic consequences of the extreme weather this brings.