Satellite data published by the National Institute for Space Research (Inpe) has shown an increase of 85 per cent this year in fires across Brazil, most of them in the Amazon region, the BBC reported.
The figures and satellite images showing most of the state of Roraima, in northern Brazil, covered by smoke have shocked many Brazilians and triggered a global Twitter trend under the hashtag #prayforamazonia.
The figures suggest that there have been more than 75,000 fires so far this year for the whole of Brazil, compared with just over 40,000 over the same period in 2018.
Meanwhile, Brazilian President Jair Bolsonaro responded to Macron's tweet saying that the French leader was using the issue for "political gain".
Bolsonaro, who has been blamed by conservationists for the Amazon's plight, saying that he has encouraged loggers and farmers to clear the land, added that he was open to dialogue about the fires if it was "based on objective data and mutual respect", but hit out at the calls for it to be discussed at the G7 summit, which Brazil is not participating in.
"The French President's suggestion that Amazonian issues be discussed at the G7 without the participation of the countries of the region evokes a misplaced colonialist mindset, which does not belong in the 21st century," he wrote on social media.
Earlier on Thursday, Bolsonaro had said that the country was not equipped to fight the fires, reports the BBC.
"The Amazon is bigger than Europe, how will you fight criminal fires in such an area?," he asked reporters as he left the presidential residence on Thursday. "We do not have the resources for that."
The President has suggested that NGOs might have started fires as revenge for his government slashing their funding.