You are given a sentence in Portuguese. Your job is to translate the Portuguese sentence into English.
Example: Os astrónomos acreditam que cada estrela da galáxia tem um planeta, e especulam que até um quinto deles tem um planeta do tipo da Terra que poderá ter vida, mas ainda não vimos nenhum deles.
Example solution: Astronomers now believe that every star in the galaxy has a planet, and they speculate that up to one fifth of them have an Earth-like planet that might be able to harbor life, but we haven't seen any of them.
Example explanation: The Portugese sentence is correctly translated into English, because the meaning is preserved.

Problem: — a Amazónia é o pulmão do mundo, não é? — pelo poder que tem de trocar massivamente gases vitais — a floresta com a atmosfera.

Solution: The Amazon is the "" lung of the world, "" because of its massive power to have vital gases exchanged between the forest and the atmosphere.