40C heat set to become reality in the UK if we don’t fight climate crisis
Days when temperatures reach a sweltering 40C in the UK could occur every three to four years by the end of the century, unless swift action is taken on the climate crisis, the Met Office has warned.
Rising temperatures caused by human activity have pushed the mercury to new record highs in this country, with 38.7C in Cambridge in July 2019 the highest temperature ever recorded.
That has left scientists wondering if 40C heat could be on the horizon, with heatwaves posing a potentially severe risk to people’s health.
Researchers at the Met Office’s Hadley Centre have looked into the likelihood of future hot spells if high or medium levels of greenhouse gas emissions continue. They said that greenhouse gas emissions, from activities such as burning fossil fuels which heat up the planet, has put the UK on course to see extremes that would be highly unlikely under a ‘natural’ climate.
Currently the chances of temperatures reaching 40C anywhere in the UK are extremely low – but could be as much as 10 times more likely than under a natural climate unaffected by humans, the researcher said.
If emissions continue at high levels, worsening climate change, the UK could see days with 40C heat every three to four years on average by 2100, the study — published in the journal Nature Communications — found.
Temperatures exceeding 35C currently occur once every five years on average, but that could rise to every other year with high emissions.
The scientists said if the world takes action on emissions in line with commitments in the international Paris Agreement to limit temperature rises to 1.5C or 2C above pre-industrial levels, the risk of extreme heat would be much lower.
The south-east of the UK is more likely to see 40C temperatures, while 35C temperatures are becoming increasingly common in the region.
But the study also found that areas in the north, where it is extremely unlikely to see days that reach 30C, may exceed that temperature at least once a decade.
Lead author Dr Nikolaos Christidis explained: ‘We found that the likelihood of extremely hot days in the UK has been increasing and will continue to do so during the course of the century, with the most extreme temperatures expected to be observed in the south-east of England.
‘Climate change has already influenced the likelihood of temperature extremes in the UK.
‘The chances of seeing 40C days in the UK could be as much as 10 times more likely in the current climate than under a natural climate unaffected by human influence.’
Dr Christidis continued: ‘The likelihood of exceeding 40C anywhere in the UK in a given year has also been rapidly increasing, and, without curbing of greenhouse gas emissions, such extremes could be taking place every few years in the climate of 2100.’
Co-author and head of the Met Office National Climate Information Centre Dr Mark McCarthy added: ‘This research shows human-caused climate change has set us on a course to see temperature extremes in the UK that would be highly unlikely under a “natural” climate, although urgent action to reduce emissions now can significantly reduce the occurrence of extreme high temperatures in the UK in the future.’
The Government’s advisory Committee on Climate Change has previously warned the UK is unprepared for the health impacts of increasing heatwaves, which can raise the risk of illness and deaths, particularly among the elderly or those with existing health conditions.
Action is needed to prevent overheating in homes, hospitals and on public transport, the committee has warned.
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