Letter

Dear Mrs. Jones,
I am writing to apply for the position of a coordinator in Campers’ Club as advertised in the local sports magazine.
I believe that I have all the necessary skills for this post since I have worked as a part-time baby sitter. Because of this, I am convinced that I would get along with the youngsters. <- (a more commonly used word would be "kids" but "youngsters" still makes sense)
In addition, I am a very energetic person who has all the patience needed to work with children. Furthermore, I am a nature lover and have been number of times camping a number of times.
I think this job would be a great opportunity for me to go camping once again and spend some time with kids. Hope to hear from you soon.
Yours sincerely,

 

I only made a few minor changes to make it flow a bit better. It was written very clearly already. Good job!

(correcion please) The cost of air travel should increase to to prevent climate cha

I completely disagree with this statement. There are countries which live off tourism and if the price of airline tickets will increases, people wouldn’t travel. It would be worse for these countries, In time, these countries would be in crisis. To prevent climate change, we must take other measures. There are simple things we can do to help. For example, we can change from light bulbs to energy saving saving light bulbs, turning off the tv and other electronic devices, plant trees… These measures that are simple to do and can help a lot if we all do them.

You could say "Most Brazilians think" or "Most of Brazil thinks". Either would be fine. :)

Hmm... that's tricky. I don't blame you for being confused. As a native English speaker, I've never really thought about it before, beyond what just sounds right. Both sentences are correct, but I prefer the former. I think it implies a more active interaction between the subject and the object. Also, "out" is usually used when something is brand new/hasn't been done by the subject previously. It's generally safe to use it in sentences like "I'm testing out a new [idea/exercise/etc.]". Another verb that commonly uses out is "to try". "To try something out" means to do something for the first time. The "out," I think, places emphasis on it being the first time. Other than that, I don't think it's too important. People will understand you regardless of whether you tack on "out" to the verb.