Fires in Brazil's Amazon rainforest rose by almost 20% in June - a 13-year high for the month, according to government data.
With such an increase at the start of the dry season, there are concerns that this year's fires could surpass 2019's disastrous blazes.
Activists say the coronavirus pandemic is exacerbating the problem.
They believe arson is likely to be even less monitored while authorities are stretched.
Many forest fires in the country are started deliberately by illegal loggers and farmers wanting to quickly clear ground.
Brazil has the world's second-highest coronavirus death toll, after the US, and there are also concerns that increased smoke could have a damaging effect on the breathing of virus patients.
- Amazon under threat: Fires, loggers and now virus
- Deforested Amazon areas 'net emitters of CO2'
- 'Football pitch' of Amazon forest lost every minute
In June, the country's National Institute for Space Research (INPE) recorded 2,248 fires using satellite imagery, as opposed to 1,880 fires in June 2019.
The burning usually increases throughout July, August and September.
"We cannot allow the 2019 situation to repeat itself," Mauricio Voivodic, executive director of the World Wildlife Fund NGO in Brazil, told the Folha de Sao Paulo newspaper, accusing the government of inaction.
Last year's fires peaked in August, with 30,901 - threefold the number for the same period the previous year.
Source from: https://www.bbc.com/news/world-latin-america-53262565