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Em conclusão, devemos preservar as espécies para evitar a extinção.

Em conclusão, devemos preservar as espécies para evitar a extinção.
In conclusion, we must preserve species to avoid extinction.
From Lesson 346:Summarizing and concluding (em suma, em conclusão, afinal)·Portuguese (Portugal)

Questions & Answers about Em conclusão, devemos preservar as espécies para evitar a extinção.

What is the difference between using em conclusão here versus em suma or afinal?
Em conclusão is used to formally wrap up an argument, literally meaning "in conclusion". Em suma means "in short" and is better for briefly summarizing a point. Afinal means "after all" or "ultimately", and usually implies a shift in expectation or a realization, which wouldn't fit this direct, summarizing statement.
Why do we use the articles as and a before espécies and extinção when English leaves them out?
Unlike English, Portuguese requires definite articles when talking about general categories in their entirety (like as espécies) or abstract concepts (like a extinção).
Could we say temos de preservar instead of devemos preservar?
Yes, but the nuance changes. Devemos expresses a moral obligation or duty ("we ought to" or "we must" for the greater good), which fits the context of protecting nature perfectly. Temos de implies a strict, almost forced necessity.
Why use para before the infinitive evitar?
The preposition para followed by an infinitive is the standard way to express purpose or intention in Portuguese. It acts just like "in order to" in English.

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