What's a 'firewave'? Why is London increasingly at risk?

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Cities across the UK are facing a growing threat from an emerging phenomenon called "firewaves" as temperatures rise due to climate change, scientists have warned. The term, coined by researchers at Imperial College London, describes multiple urban wildfires triggered by extended periods of hot, dry weather. The warning comes as firefighters battled three separate heath fires in London in recent days. For London Latest, the BBC's Climate Editor Justin Rowlatt has the story. (Image: Dartford Heath 2022, Getty Images)