The Amazon rainforest, often referred to as the “lungs of th...

The Amazon rainforest, often referred to as the “lungs of the Earth,” plays a crucial role in regulating the planet’s climate. Covering approximately 5.5 million square kilometers, it is home to an incredible diversity of flora and fauna. The forest produces about 20% of the world’s oxygen and absorbs vast amounts of carbon dioxide, helping to mitigate the effects of climate change. However, deforestation poses a significant threat to this vital ecosystem. Efforts to protect and restore the Amazon are essential for maintaining global ecological balance. 
What does the phrase “lungs of the Earth” refer to in the text?