Could someone correct my letter ? thanks

Dear sir,
I am writing in response to your letter about the lack of role models today. Firstly, I think that our society is full of role models which are a reference no t only for some people, but also for the humanity. Secondly, I go along with you that the world is becoming gloomy, indiviudalistic and grievous, but, this is not a parameter to generalize the matter.
The world is full of references and models. Honestly speaking, I would like to mention na important human being; a pioneer in my country who has inspired the whole world. His name is Chico Mendes.Chico was a very simple man, rubber tapper,unionist and environmental ativist. He was popular for fighting against ranchers and deforestation of the Amazon forest. His lifestyle wasvery simple and allowed him to make a living without damaging the environment. In view of this, Chico developed a strong social conscience about the forest , which was exremely important for his life. Chico started to work as a rubber stapper with his family in Acre State, Brazil. Around the years , due to the dispute for land and richnesses, some conflicts start to occur in the region. Consequently, Chico Mendes decided to fight against ranchers who were opposed to his ideas. At first, as a leader, Chico started to act politically in order to garantee some rights to rubber tappers, founding unions and uniting them.
He also was the founder of a local council in Xapuri. He advocated the idea of creating many forest reserves that could be managed by traditional communities, and sustainably harvesting goods such as rubber and Brazik Nuts. He is a reference for all rubber tappers , once that he banded them together in a National Union. He also won two international environmental awards . Above all, Chico mendes was a real risk taker and unfortunately, because of this he paid a high price foor such a great endeavor: his life. On December, 22 in 1988 Chico was murdered by ranchers opposed to his ativism.
Overall, what I really like in Chico Mendes personality was his kindness and resignation. He had a collective spirit that was spread all over the planet. He lives in every human being in this planet and he will never be forgotten.