In recent years, intense and intense wildfires have occurred more commonly in the United States and elsewhere in northern and southern California. The AFP, together with scientists, talked about how climate change could make them worse.
Other factors have also triggered an increase in the frequency and intensity of major fires, including human infestation in forested areas and suspicious forest management. David Bowman, a professor of environmental change biology at the University of Tasmania and a forest fire expert, said: "The patient was already sick.
"But climate change is an accelerator."
Sunny weather of fire
All firefighters can advise on prescriptions for hot, dry and windy "helpful weather".
Many tropical and temperate regions devastated by the rapid rise of forest fires are predicted in climate models to see higher temperatures and more droughts.
Christopher Williams, director of environmental science at Clark University in Massachusetts, said, "In addition to bringing more dry and hot air, climate change, such as increasing evaporation rates and drought penetration, Generated.
In the past two decades, California and Southern Europe have seen many droughts that occurred only once a century.
Dry weather means more dead trees, shrubs, and grass, which can cause a fire.
Michel Vennetier, an engineer at the French National Institute of Environment and Agriculture, said, "In extreme dry conditions, there is a huge amount of dry biomass.
"It's an ideal flammability."
Change in landscape
To make matters worse, new species that better adapt to semi-dry conditions grow in their place.
"Moisture-like plants have disappeared and have been replaced by flammable plants that can withstand dry conditions such as rosemary, wild lavender, and thyme," Vennetier said.
"Change happens very quickly."
As the amount of mercury increases and rain is less, trees and shrubs that are stressed by trees spray deep roots deep into the soil and suck all the water droplets that nourish the leaves and needles.
This means that there is no longer any moisture on the planet that may have helped to slow down the passing of forests and roads.
In the temperate zone of the northern hemisphere, fire seasons in July and August were historically short.
IRSTEA scientist Thomas Curt pointed out that the period of vulnerability to forest fires today extended from June to October.
In California, caused by the recent five-year drought, some experts say there are no more seasons. Fire can occur all year round.
Mike Flannigan, a professor at the University of Alberta in Canada and director of the Western Partnership for Wildland Fire Science at Wildland Fire Science, says, "The more you get warmer, the more lightning you get.
"There are more fires, especially in the north."
At the same time, he pointed out that 95% of the world's forest fires were started by humans.
Weakened jet stream
The normal weather patterns of North America and Eurasia depend heavily on strong, high-altitude airflows created by the contrast between polar regions and equatorial temperatures, known as jet streams.
However, global warming has weakened that airflow by raising the Arctic temperature twice as fast as the global average.
"We see enormous weather conditions called clogged ridges, a high-pressure system in which the air sinks and gets warmer," Flannigan said.
"Firefighters have been known for decades to be helpful in fire activities."
Climate change not only increases the likelihood of forest fires, but also increases the intensity of forest fires.
As in California last summer, "if the fire gets too bad" and "there is no immediate action to stop," Flanigan said.
"It's like spitting in a bonfire."
As the temperature rose, the beetle moved north to Canada 's Daelim region, causing chaos along the way and killing the tree.
"The bark beetle outbreak temporarily increases the flammability of the forest, increasing the amount of dead material like needles," Williams said.
Globally, forests account for about 45% of the world's fixed carbon and absorb a quarter of human GHG emissions.
But as the forest dies and burns, some carbon is released back into the atmosphere, contributing to climate change in a vicious cycle that scientists call "positive feedback."