Question

how can you say forests are lungs of our earth

Answer 1

there are lots of carbondioxide in there but the human breathe oxygen and release carbinfioxide.the tress observe the carbon dioxide and release the oxygen that is why I am say that forests are the lungs of our earth

Answer 2

forest are called lungs of our earth because we need oxygen to live on the earth and this oxygen is provided by trees and trees give us life.