Record temperatures have begun in northern Europe this week, with authorities in Germany and France on alert. Experts have said heat waves are on the increase worldwide, further evidence of climate change.
A searing heat wave has begun to spread across Europe, with Germany, France and Belgium experiencing extreme temperatures that are set to continue in the coming days.
In Germany, temperatures are expected to exceed 40 degrees Celsius (104 degrees Fahrenheit) on Wednesday, topping the country's previous June record of 38.2 degrees Celsius, set in Frankfurt in 1947. Temperatures in Bonn on Tuesday afternoon reached 35 degrees.
Firefighters braced for busy week
Climate researcher Andreas Marx has said that the lack of rain in much of the country, particularly in the north and east, the site of much of Germany's agriculture, could have disastrous consequences.
Forest fires are of particular concern for authorities in Germany, especially in the northeast. Local residents were asked to keep windows and doors closed in Lieberoser Heide — southeast of Berlin — while emergency services deal with a fire that broke out on Monday and spread to an area of about 10 hectares (25 acres), the size of 140 soccer pitches. It is expected to take a few days to put out.
'We must be vigilant': Macron
Meanwhile, French national weather agency Meteo-France predicted that the hot weather could produce temperatures of up to 40 degrees Celsius, while German agencies suggested the heat may break records.
"It's unprecedented because it's hitting so early, in June. We haven't seen this since 1947," said Emmanuel Demael from the French meteorological agency on Monday.
French President Emmanuel Macron has urged people to be extra vigilant in the coming days.
"As you know, at times like these, sick people, pregnant women, infants and elderly people are the most vulnerable. So we must be vigilant with them and have prevention measures in place in order to intervene as quickly as possible," he said.
His call was repeated by the International Federation of Red Cross and Red Crescent Societies in Geneva: "Our message this week is simple: look after yourself, your family and your neighbours. A phone call or a knock on the door could save a life."
In 2003 an estimated 70,000 people died in Europe during a heatwave.