Okay, whether the Amazon is actually the planet's lungs, here is an interesting story:
Despatch from Sao Paulo | International
How did the planet’s lungs catch fire?
Shobhan Saxena August 31, 2019 21:15 IST Updated: September 01, 2019 12:16 IS
In the first week of August, some messages began to circulate in a WhatsApp group comprising 70 ranchers, land-grabbers and illegal miners in Pará, a State located in the Amazon rainforest. In the messages, the group hatched a plan to start fires in the forest along a highway in the region on August 10. They designated it as the “Day of Fireâ€. As the fires lit by them began to sweep huge swathes of trees, the group shared another set of messages. These carried instructions on how to blame some NGOs for the blazes which were sending plumes of smoke up to Sao Paulo, some 3,000 km away. In a few days, countless fires — 26,000 as per some estimates — erupted across the Brazilian rainforest.
This brazen crime, exposed by the Globo Rural magazine on August 25,was committed for two objectives: grabbing of forest land and areas reserved for indigenous tribes; and to show their defiance to the Brazilian Environmental Institute (IBAMA), which monitors the forests and fines those who violate environmental laws.
With the far-right President, Jair Bolsonaro, repeatedly talking of clipping the wings of IBAMA, the agency seems helpless.
Read more at: https://www.thehindu.com/news/international/how-did-the-planets-lungs-catch-fire/article29309900.ece
The next paragraph reads these fires are not accidental or natural.