You are given a sentence in Portuguese. Your job is to translate the Portuguese sentence into English.

Let me give you an 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.
The answer to this example can be: 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.
Here is why: The Portugese sentence is correctly translated into English, because the meaning is preserved.

OK. solve this:
Estou aqui para vos falar sobre a economia invisível da Natureza.
Answer:
I'm here to talk to you about the economic invisibility of nature.