China floods: thousands evacuated from submerged subway trains

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Severe flash floods have hit central China. The city of Zhengzhou saw more rain in one hour than the flood-stricken parts of Germany had in a day, and the forecast is for yet more rain. The floods in Europe and China follow extreme heat in the US and elsewhere. The US Climate envoy John Kerry says world leaders must act now to avoid even worse natural disasters. And France is seeing a new spike in Covid cases. Can a controversial health pass help to contain it?