Question

Why are tropical EVERGREEN forest known as lungs of earth

Answer 1

It is because it absorbs a large amount of carbon-dioxide and produces oxygen. This is why they are called as "the lungs of the earth."

Answer 2

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Tropical rainforests are often called the “lungs of the planet” because they generally draw in carbon dioxide and breathe out oxygen. But the amount of carbon dioxide they absorb, or produce, varies hugely with year-to-year variations in the climate.