In this Aug. 20, 2019 drone photo released by the Corpo de Bombeiros de Mato Grosso, brush fires burn in Guaranta do Norte municipality, Mato Grosso state, Brazil. (CNN photo)
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The Amazon forest produces about 20% of the world's oxygen, and is often called "the planet's lungs."
Fires are raging at a record rate in Brazil's Amazon rainforest, and scientists warn that it could strike a devastating blow to the fight against climate change.
