Using Copernicus Sentinel-3 data, as part of the Sentinel-3 World Fires Atlas, 3951 fires were detected at night from 1 August to 24 August 2019, compared to 1110 fires detected in 2018 during the same period. Credit: Contains modified Copernicus Sentinel data (2019), processed by ESA on ONDA Copernicus DIAS

Thousands of fires have broken out in the Amazon rainforest. Satellite data show that there are almost four times as many fires this year compared to the same period last year. Apart from Brazil, parts of Peru, Bolivia, Paraguay and Argentina have also been affected.

While normally occur in Brazil's dry season, which runs from July to October, the unprecedented increase is reported to come from both legal and illegal deforestation which allows land to be used for agricultural purposes, rising are also thought to be making the region more susceptible to fire.

The Amazon basin is the world's largest tropical rainforest, spanning four countries and is home to millions of plants and animals. It produces around 20% of the world's oxygen—hence the region being called "the lungs of the world"—and is crucial for helping to regulate global warming as the forests absorb millions of tonnes of carbon emissions every year.

Using Copernicus Sentinel-3 data, as part of the Sentinel-3 World Fires Atlas, almost 4000 fires were detected from 1 August to 24 August 2019, while last year there were far fewer during the same period, just 1110 fires.

"By processing 249 images for August 2018 and 275 images for August 2019, we are able to see the incredible number of fires burning in the Amazon. This was achieved by the World Fire Atlas night time algorithm, in order to avoid any possible false alarms with the daytime algorithm," says ESA's Olivier Arino.

An unprecedented number of fires have broken out in Brazil’s Amazon rainforest. In this image, captured on 21 August 2019, the fires and plumes of smoke can clearly be seen. Credit: contains modified Copernicus Sentinel data (2019), processed by ESA, CC BY-SA 3.0 IGO

Plumes of smoke have spread across the Amazon region. Strong winds have blown smoke to São Paulo—more than 2500 km away— causing a black out in the city. According to the Copernicus Atmosphere Monitoring System (CAMS), smoke has traveled as far as the Atlantic coast.

CAMS also reports that the fires have released 228 megatons of carbon dioxide into the atmosphere, as well as copious amounts of carbon monoxide. The fires also threaten the lives of many indigenous people.

The Copernicus Emergency Mapping Service was activated to help respond to the . The service uses to help civil protection authorities and, in cases of disaster, the international humanitarian community to help to respond to emergencies.

This false-colour animation captured by the Copernicus Sentinel-2 mission shows the fires breaking out on the border between Bolivia, Paraguay and Brazil. The animation contains three separate images from 8, 18 and 23 August 2019. On the 23 August, the smoke from the fire is visible in blue, while clouds can be seen in white. The orange areas show the burned land. Credit: Contains modified Copernicus Sentinel data (2019), processed by ESA; CC BY-SA 3.0 IGO

The severity of the fires has reached the highest political levels. Deemed an international crisis, the G7 nations who met in France yesterday, have offered a 20 million euro emergency funding to assist Brazil and its neighboring countries to put out the fires, according to French President Emmanuel Macron.

Josef Aschbacher, ESA's Director of Earth Observation Programmes, said, "As we continue to face the ongoing climate crisis, satellites are essential in monitoring wildfires in remote areas, especially for a key component of the Earth system such as the Amazon."