As the Earth heats up, high-temperature records are being broken more often

As the Earth continues to heat up due to man-made climate change, "hottest temperature on record" has become an increasingly common refrain. Dozens of countries have hit their high-temperature marks in the 21st century.

Climate change has increased the frequency of extreme weather events

A woman walking down a crowded Venice street holds a towel over her head to block the sun.
People try to cool off on a hot day during Redentore festival celebrations in Venice, Italy, as the second heat wave of the summer hits on July 16, 2022. Experts say there's at least a 10 per cent chance that 2022 will surpass 2020 and 2016 as the hottest year on record. (Manuel Silvestri/Reuters )

It sounds like a broken record: as the Earth continues to heat up due to man-made climate change, "hottest temperature on record" has become an increasingly common refrain.

The U.K. had its hottest day ever on Tuesday, climbing past 40 C for the first time and adding to a long list of weather records in recent years. Dozens of countries have hit their high-temperature marks in the 21st century.

Experts warn that climate change has increased the frequency of extreme weather events, with studies showing that the likelihood of temperatures in the U.K. reaching 40 C is now 10 times higher than in the pre-industrial era.

Here's a round-up of some of the weather records that have fallen in Canada and around the world — just during the 2020s. 

Global warming

Let's start big. The last seven years are the hottest on Earth "by a clear margin" in records dating back to 1850, EU's Copernicus Climate Change Service said early this year. 

2020 and 2016 were tied for the hottest year globally, and there's at least a 10 per cent chance 2022 will surpass them, according to the U.S. National Oceanic and Atmospheric Administration. There's only a one per cent chance 2022 won't crack the top 10.

According to an April report by the UN's Intergovernmental Panel on Climate Change, temperatures on Earth will shoot past a key danger point unless greenhouse gas emissions fall faster than countries have committed. 

The report's authors said they had "high confidence" that unless countries step up their efforts to cut greenhouse gas emissions, the planet will be, on average, 2.4 C to 3.5 C warmer by the end of the century — a level experts say is sure to cause severe impacts for much of the world's population.

A white police truck drives down a road past shells of burned-out vehicles and structures destroyed by a wildfire.
An RCMP vehicle drives past the remains of vehicles and structures in Lytton, B.C., on Friday, July 9, 2021, after a wildfire destroyed most of the village on June 30. Climate change has increased the frequency of extreme weather events like the Lytton wildfire, experts say. (Darryl Dyck/The Canadian Press)

Canadian heat record

Just a day before Lytton, B.C., was razed to the ground by a wildfire that killed two people, the village set a new Canadian heat record of 49.6 C.

The same "heat dome" left the ground parched, contributing to catastrophic flooding in B.C. months later.

Lytton, about 100 kilometres northeast of Vancouver, actually broke heat records on three consecutive days. Before that week, the highest temperature ever recorded in Canada was 45 C in Saskatchewan in 1937.

Modelling and analysis by researchers at universities in the United Kingdom said that last year's heat wave across western North America was the sixth hottest ever globally.

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Arctic heat record

The UN weather agency certified a 38 C reading in the Russian town of Verkhoyansk on June 20, 2020, as the highest temperature ever recorded in the Arctic.

The World Meteorological Organization said the temperature "more befitting the Mediterranean than the Arctic" was registered during a heat wave that swept across Siberia and stretched north of the Arctic Circle. 

Verkhoyansk is usually known for its extreme cold, with temperatures dropping below –60 C.

A young woman sits on the protest at a protest. She is holding a sign that says 'There is no Planet B.'
A climate activist holds a sign in 2020 in Berlin. A recent UN climate assessment warned that humanity must drastically cut greenhouse gas emissions or face increasingly catastrophic changes to the world's climate. (Omer Messinger/Getty Images)

The fallout of higher temperatures

Of course, rising temperatures affect more than just the thermometer. Here are some other, non-temperature records that have been broken recently amid the changing climate.

The world's oceans grew to their warmest and most acidic levels on record in 2021, the World Meteorological Organization said in its annual State of the Global Climate report. It also said melting ice sheets had helped push sea levels to new heights.

Wildfires that forced evacuations of a number of remote northwestern Ontario First Nations burned more hectares of land in the province in 2021 than in any other year in history, surpassing the record set 26 years ago.

The 2020 hurricane season was the most active on record, with 30 tropical storms.

Though the high number may have had more to do with La Nina than climate change, experts say the hurricanes that form are bigger, stronger and last longer due to warming ocean temperatures. 

With files from The Associated Press and Reuters