Millions of dollars in aid are being pledged. Hundreds of soldiers are heading into the jungle. The Amazon is burning - and the world has taken notice.

Now comes the hard part.

The fight to quell the blazes will be waged not only in one of the most inhospitable places on Earth - an expanse so vast, dense and remote that many of the fires can be reached only by foot - but also in a country where the president is openly antagonising the donors who are trying to help.

The twin challenges - one political, the other environmental - were feeding each other Monday, further muddying a response that activists and analysts stress must be broad and swift to temper what could be significant damage to the world's most important forest.

The fires are not traditional in any sense. Most have been set intentionally, by farmers and loggers clearing land. The ground is not arid but sodden.

Amazon rainforest swept by fires: In pictures Show all 25 1 /25 Amazon rainforest swept by fires: In pictures Amazon rainforest swept by fires: In pictures Fire rages in the Amazon rainforest in the Brazilian state of Rondonina on August 23 Reuters Amazon rainforest swept by fires: In pictures Smoke billlows from burning tracts of the Amazon rainforest in the Brazilian state of Para on August 23 AFP/Getty Amazon rainforest swept by fires: In pictures Fire rages in the Amazon rainforest in the Brazilian state of Rondonina on August 23 EPA Amazon rainforest swept by fires: In pictures Land in the Amazon rainforest left scorched in the fires in the Brazilian state of Rondonina on August 23 AFP/Getty Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Rondonia, Brazil on August 23 AFP Amazon rainforest swept by fires: In pictures Fire tears through a farm in the Brazilian state of Mato Grosso AP Amazon rainforest swept by fires: In pictures An area of the Amazon rainforest left scorched in the fires in the Brazilian state of Amazonas on August 24 AFP/Getty Amazon rainforest swept by fires: In pictures Satellite images show a series of fires in the southwest Brazilian state of Rondonia on August 15 AP Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Rondonia, Brazil Reuters Amazon rainforest swept by fires: In pictures A satellite image released by NASA shows the active fires that have been detected in the Amazon region EPA Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Amazonas, Brazil Reuters Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Rondonia, Brazil Reuters Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Rondonia, Brazil Reuters Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Amazonas, Brazil Reuters Amazon rainforest swept by fires: In pictures Indigenous people from the Mura tribe wallk in a deforested area inside the Amazon rainforest in the Brazilian state of Amazonas on August 20 Reuters Amazon rainforest swept by fires: In pictures Fire tears through a farm in the Brazilian state of Mato Grosso AP Amazon rainforest swept by fires: In pictures Smoke billows from a stretch of fire in the Amazon rainforest in the Brazilian state of Rondonia on 23 August AFP/Getty Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Amazonas, Brazil Reuters Amazon rainforest swept by fires: In pictures Indigenous people from the Mura tribe wallk in a deforested area inside the Amazon rainforest in the Brazilian state of Amazonas on August 20 Reuters Amazon rainforest swept by fires: In pictures Smoke billows from a stretch of fire in the Amazon rainforest in the Brazilian state of Rondonia on 23 August AFP/Getty Amazon rainforest swept by fires: In pictures A view of logs felled illegally in the Amazon rainforest are seen in sawmills in the Brazilian state of Amazonas on August 22 Reuters Amazon rainforest swept by fires: In pictures A scorched patch of land in the state of Mato Grosso in Brazil on 20 August EPA Amazon rainforest swept by fires: In pictures Several fires are seen burning in the Amazon rainforest in this satellite image taken by NASA on 11 August AFP/Getty Amazon rainforest swept by fires: In pictures Smoke billows from a stretch of fire in the Amazon rainforest in the Brazilian state of Rondonia on 23 August AFP/Getty Amazon rainforest swept by fires: In pictures The sunsets behind clouds and smoke from fires in the Amazon rainforest in the Brazilian state of Rondonia on 18 August EPA

And it's not one big blaze but hundreds, many separated by wide distances. It will require a well-organised effort, analysts say, to stamp out the fires - and make sure they stay out.

But a personal dispute between the presidents of Brazil and France threatened to overshadow the danger facing the Amazon, which is regarded as essential to curbing global warming.

"We cannot accept that a President, Macron, issues inappropriate and gratuitous attacks against the Amazon," he tweeted. "Nor that he disguises his intentions behind an 'alliance' of the G7 countries to 'save' the Amazon, as if it were a colony or no man's land."

Speaking to reporters, Mr Bolsonaro questioned the donors' intentions: "Would someone help someone else . . . without expecting anything in return?"

His government ultimately decided it will reject the G7 offer, Brazilian media reported late on Monday evening.

Macron called Mr Bolsonaro's behaviour shameful.

"For him to have made incredibly disrespectful comments about my spouse - what can I say to you?" Mr Macron said. "It is sad. It is sad. But it is sad first of all for him and the Brazilian people."

Jair Bolsonaro has rejected worldwide offers of aid to abate the fires as 'colonialism' (AFP/Getty Images) (AFP/Getty)

Mr Bolsonaro campaigned last year on promises to open up the Amazon to development. Since his inauguration in January, deforestation - much of it illegal - has surged.

Scientists warn that the forest is fast approaching a tipping point - between 20 percent and 25 percent deforestation - when the damage could be irreversible, and large swaths could transform into savanna.

Perhaps the clearest manifestation of the degradation is the most elemental: fire. The number of blazes in the Amazon states has risen by more than 75 percent this year, and the rate at which they're scorching the earth has doubled.

After farmers and loggers hack down the forest, the easiest way to dispose of the foliage is to let it dry out in the sun for months - then set it ablaze. Smoke from these fires blanketed distant cities last week, grounding flights and sending patients to hospitals with smoke inhalation.

Countries in Latin America, the Middle East and beyond have offered money and firefighters. But leaders in Brazil, a former Portuguese colony long wary of foreigners' interest in the Amazon, have expressed concern over what Bolsonaro has described as a "colonialist mentality."

Scientists, meanwhile, have been more preoccupied with the practical concerns of the task before firefighters.

The Bolsonaro administration has set aside $7 million (£5.7m) to combat the fires and readied 44,000 troops to deploy. Four hundred have been sent to the northern state of Rondonia, where 4,600 fires have burned this month, and the air force has launched planes to shower the flames.

The job ahead won't be easy.

"We're talking about battling what will be hundreds of fires burning simultaneously, beyond any road network, distributed across thousands of miles," said Douglas Morton, chief of the Biospheric Sciences Laboratory at NASA's Goddard Space Flight Center.

Swathes of the Amazon rainforest are turning to ashes as fires ravage the greenery (AFP/Getty Images)

"It's quite a challenge to mobilise resources for one of these fires, but to simultaneously track down and put out a number of these sorts of fires . . . demands essentially a full press.

"You really do need thousands of people," he said.

The first challenge is just reaching the fires, many of which occur hundreds of miles from the forest's edge.

"That's why there is a huge focus on prevention," said Paulo Brando, a professor of physical sciences at the University of California at Irvine who has spent years working on the issue. "Once these fires spread in gigantic areas, they are very hard to contain."

The central paradox of the fires, however, is that they can wreak significant damage without being all that strong. When compared with the towering infernos that are visited upon California every year, the Amazon fires are minuscule.

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Almost all that have burned in 2019 have been what's considered low-intensity - barely knee-high - a Level 1 on a scale of 3.

But because of the fragility of the environment, Morton said, the fires are devastating. The Amazon rainforest, soaked in hundreds of inches of rainfall annually and home to some of the wettest land on Earth, simply isn't able to withstand them.

"The fires are unremarkable from a standpoint of the intensity of fire, but equally remarkable to the damage it can do to the Amazon," Morton said. "The fire is enough to kill most of the trees because they're not adapted to fire."

On Monday, some questioned whether the resources so far marshalled were enough for the challenge.

The $22.2 million (£16m) donated by the G7 countries would go fast, said Rick Swan, an official with the International Association of Fire Fighters.

"For a reference point, the Tubbs Fire in 2017 [in northern California], the firefighting costs alone were $100 million," he said.

And the Amazon fires this year might only be getting started.

Ane Alencar, the director of science at Amazon Environmental Research Institute, said more were almost certainly on the way.

Those burning now were lit using trees cut in May and June. An area amounting to half the size of Rhode Island was cut down in July alone, and those trees have yet to spark.

"We are still waiting," she said. "The peak of the burning season in the Amazon is around September."