In 2023 forest fires destroyed nearly 400 million hectares (988 million acres) of land around the world, killed more than 250 people and emitted 6.5 billion tonnes of the greenhouse gas carbon dioxide.
Pauline Vilain-Carlotti, a researcher in geography and wildfires, told AFP 2023's fires had been "out of control" and showed that firefighting capacities were inadequate. Efforts should now be focussed on prevention rather than cure.
"We are no longer capable of coping under current conditions with the current firefighting manpower, thus the importance of acting beforehand on prevention, rather than afterwards on firefighting and extinguishing," she said.
- Historic fires in Canada -
Records tumbled on the American continent this year as it went through a forest fire season in which nearly 80 million hectares (198 million acres) had burned by December 23.
That is one and a half times the surface area of Spain, and 10 million hectares (24 million acres) more than the average from 2012-2022 on the same date, according to the Global Wildfire Information System (GWIS).
Canada, where 18 million hectares (44.5 million acres) went up in smoke over the year, drove the increase.
The fires were caused by dryer and hotter weather conditions driven by climate change.
- Deadly year -
With 97 dead and 31 missing in fires in Hawaii in August, 34 killed in Algeria, and at least 26 dead in Greece, the year with more than 250 deaths overall was the deadliest of the 21st century, according to the Emergency Events Database (EM-DAT) run by the Catholic University of Louvain in Belgium.
Vilain-Carlotti told AFP the rate of excess deaths risks increasing in the coming years, as wildfires come dangerously close to towns and cities.
In 2023 the wildfires engulfed not only areas usually susceptible to forest fires like Greece, Italy, Tunisia, and Algeria in the Mediterranean basin and North America and Australia, but also areas which are usually spared like Hawaii or Tenerife.
In August, Hawaii's historic royal seat of Lahaina was levelled by a wildfire.
- Six billion tonnes of CO2 -
As the fires spread even further, vegetation has less time to regrow, leaving the forests liable to lose their capacity to absorb carbon dioxide.
According to recent studies, the fires reduce the storage of carbon dioxide by around 10 percent, Solene Turquety, a researcher at France's LATMOS (Atmospheres, Environments, Space Observations Laboratory), said.
And as they burn, the trees suddenly release all of the CO2 that they have stored.
Since the beginning of 2023, wildfires have released some 6.5 billion tonnes of carbon dioxide, according to GWIS.
That compares to 36.8 billion tonnes from fossil fuels like oil, gas and coal and cement.
As a rule, around 80 percent of carbon generated by the forest fires is then reabsorbed by the vegetation which grows again the next season.
The remaining 20 percent then builds up in the atmosphere, contributing the climate change.
- Immediate health impact -
Apart from CO2, fires release a string of dangerous particles, from carbon monoxide to ash, soot, and organic carbon.
"These emissions very heavily alter the air quality, over hundreds of kilometres (miles) in the case of the most intense fires," Turquety said.
She said there is "an immediate health impact" on top of "the destruction of ecosystems, property and infrastructure".
According to a study published in September in Nature, the populations of the poorest countries, in particular in central Africa, are by far more exposed to the air pollution caused by these fires than those in industrialised countries.
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