How bad are the fires this year?
Roaring fires have ripped through Greece, belching thick clouds of choking smoke and forcing tens of thousands of people to flee.
The area of the country burned by wildfires, as of 23 July, is well above the average for the last 16 years.
The deadly heatwave baking Europe, stoked by carbon pollution, has made conditions ripe for fires to spread across the continent.
How dangerous are wildfires?
There are many ways fires can hurt you. The first is getting caught by the flames. With fast winds and dry plants, a fire can spread faster than you can run from it. Burns are the biggest killer. Heatstroke and dehydration pose a particular problem for firefighters.
Wildfire survivors, some of whom go through the trauma of losing family, homes and businesses, show increased rates of depression. The effects can last decades and are strongest in children.
But even people far from the flames can be harmed by the smoke. The wind carries tiny, toxic particles of burned matter that enter the lungs and pass into the bloodstream, where they wreak havoc on the cardio-vascular system.
These wildfire-related PM2.5 – particulate matter smaller than 2.5 micrometres in diameter – are associated with asthma, weak lungs and early death.
In Greece, concentrations of these deadly particles are already well above average for the year.
What caused the wildfires?
Many things can spark a wildfire: campfires, cigarettes, lightning, even sunlight. But how far it spreads depends on the weather.
By burning fossil fuels and destroying nature, people have heated the planet by 1.2C – and Europe by 2C – above pre-industrial levels, making the hot, dry conditions in which wildfires thrive more common across the continent.
Scientists cannot know exactly how big a role the climate crisis has played in the Greek wildfires until they carry out an attribution study. But they expect fires in the region to grow stronger in the future.
In its latest review of the science, the Intergovernmental Panel on Climate Change found that heat-induced fire weather in southern Europe will increase by 14% if the planet heats by 2.5C. Current policies put it on track for 2.7C.
Who is affected?
The destruction is worst on the islands of Rhodes, Corfu and Evia. There, residents and tourists have sought shelter as firefighters tackle the blazes, while emergency services ferried people away from danger. Many visitors from abroad have flown home.
Copernicus, the EU’s Earth observation agency, showed fire danger risk across most of Greece, Italy, Spain and Turkey, as well as parts of north Africa and central Europe.
How can people stay safe?
By avoiding wildfires, if possible, and by protecting themselves from smoke – for instance by closing windows or staying indoors.
The holes in regular Covid-19 masks are big enough to let in PM2.5 particles, but well-fitted N95 respirator masks offer some protection.
The Red Cross tells people to be ready to evacuate quickly and to familiarise themselves with the community’s response plan.
Governments can cut their carbon pollution to prevent hot weather getting worse, and fund firefighters, doctors and nurses to deal with its effects today.
