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    UN chief warns London faces extreme heatwave and fossil fuel dangers

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    By Latest News Editor on June 24, 2026 World News
    UN chief warns London faces extreme heatwave and fossil fuel dangers
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    Get you up to speed: UN chief warns London is ‘cooking’ amid unprecedented heatwave | News World

    UN Secretary General Antonio Guterres delivered a warning about climate and energy crises during his address at London Climate Action Week as the city experiences a severe heatwave. A red weather warning for extreme heat has been issued by the Met Office, with temperatures expected to approach record highs.

    Temperatures across England are expected to potentially exceed the previous June record set in 1976, with a red weather warning issued from 9am on Wednesday to 9pm on Thursday covering a swath from London to Swansea. Network Rail has advised passengers to limit travel during this period, citing concerns that extreme heat could affect railway safety and services.

    UN Secretary-General Antonio Guterres has warned of the dangers associated with fossil fuels, urging a swift transition to clean energy during his address at London Climate Action Week. In addition, the Met Office has issued a red weather warning as extreme heat threatens the region, advising the public to limit travel in affected areas on Wednesday and Thursday.

    What remains unclear — It is not specified how long the extreme heatwave is expected to last.

    UN chief warns London faces extreme heatwave and fossil fuel dangers

    The United Nations chief has warned that London is ‘cooking’ while issuing a sobering reminder of the dangers of fossil fuels.

    UN Secretary General Antonio Guterres referenced Charles Dickens’ novel A Tale Of Two Cities in a major address at London Climate Action Week as the capital swelters in a severe heatwave.

    ‘London isn’t just calling. It’s cooking,’ the UN chief said.

    ‘Crisis brings clarity and here in London – the city of Dickens – it is clear that our world is facing a ‘tale of two crises’,’ he added.

    ‘A climate crisis is pushing us deeper towards higher temperatures and closer to catastrophic tipping points, and an energy crisis is exposing the folly of a world hooked on hydrocarbons.

    ‘On the surface, these crises may seem separate, but they share the same destructive origin: fossil fuels.’

    Temperatures are expected to smash the June record set in 1976 by several degrees as human-driven climate change intensifies the impact of a heat dome settling over western Europe.

    UN chief warns London faces extreme heatwave and fossil fuel dangers
    Guterres gave the sobering warning during an address today (Picture: PA)

    The arrival of the El Niño warming weather phenomenon this summer risks ‘blowing the house down’ as it compounds the escalating impacts.

    Guterres’ speech comes amid market volatility because of the ongoing Iran War, which has caused fossil fuel prices to surge.

    Both crises demand the ‘same answer’, he said: ‘A fast, fair transition to clean energy and a surge in adaptation, resilience and climate justice for those already facing climate harm.’

    A red weather warning for extreme heat covering an area stretching from London to Swansea and Somerset to Birmingham was issued by the Met Office from 9am on Wednesday to 9pm on Thursday.

    The temperature could come close to the UK’s all-time high of 40.3C which was measured in July 2022.

    Latest London news

    To get the latest news from the capital, visit WTX’s London news hub.

    Overnight, the temperature did not dip below 20C at nine locations across England, recording what the Met Office classifies as a tropical night.

    The hot weather led to thunderstorms and lightning strikes over England during the early hours of Tuesday.

    FOLLOW THE LATEST ON UK HEATWAVE IN OUR LIVE BLOG

    LONDON, UNITED KINGDOM - JUNE 22: A woman holds an umbrella to protect herself from sun during a heatwave as London Eye is seen in London, United Kingdom on June 22, 2026. The UK Met Office issued a rare red weather warning for large parts of England and Wales due to an extreme heatwave expected to hit the country. (Photo by Rasid Necati Aslim/Anadolu via Getty Images)
    Londoners are looking for any solution to beat the heat (Picture: Getty)

    Advice has also been issued for transport users, with Network Rail warning passengers should ‘only travel if absolutely essential on Wednesday and Thursday’.

    Jake Kelly, deputy chief executive of Network Rail, said: ‘Extreme heat can have a significant impact on the railway, so safety must come first.

    ‘We’re asking passengers to check before travelling on Tuesday, and only travel if absolutely essential on Wednesday and Thursday if they are going to, from or within the red warning zone, as temperatures are expected to peak.

    ‘If you do need to travel in this area or outside of it, where it will still be hot, please plan ahead, allow extra time and take necessary precautions, such as carrying water, to stay safe. We thank passengers for their patience and understanding during this period.’

    Transport for London (TfL) warned customers of possible disruption to rail and Tube services, saying rail temperatures could lead to temporary speed restrictions and reduced services.

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