Amazon rainforest fire.jpg
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.
