Every time I see trash on the streets that was thrown by a personsomebody on purpose, I get mad and frustrated knowing that this person is actually helping raiseing the probabilitichances of more unnatural substances from the trash leaking into the land ,which causes to poisoning it and destroys ourearth, which is harmful to the planet.

I changed words that sounded more natural in the sentence.
"raising" already indicates an increase, you don't need the word "more".

While the moment I see ithat happens, my mind is telling me "you have got to do something about it, even if it's a small thing".

When i reailazed it,But then I started to think how am i supporsed to actually convince people to be more careful and knowunderstand that they are obligated to keep safe our world because hsafe. How can we live in a poisoned place where it'sn we're destroysing our food scousrces, places, animals and our health the ability live, it? Living is such an important thing becuause thait is why we are born for, to exerience.

And then I understood something, I can not convince all the peopleveryone to change their complulsion and chavnge the neededir behaviour to save and keep our planethe planet and keep it safe,. But if i can change at least one of them and eve, maybe I can mannage to convince many of them. I will have a grope that theirup of people with habits that will enchance the erath health likearth. For example, instead of trowing trash on the street, just don't be lazy and tthey throw it into the grarbage and even withbin, and when they sees some trashes on the street, devote many minutes andthey would devote some time to pick ito up to the grabageand get rid of it properly.

So ithis is necessary to start treating ithings as if we really want to live and save our world because this is our burden, and if you can convince and change people's habits, do it for our own sake.

Every time I see trash on the street that was thrown by a person on purpose, I get mad and frustrated knowing that this person is actually helping raise the probabilities of more unnatural substances from the trash leaking into the land , which causes to poisoning it and it destroys our planet.

- always a space after a comma, never a space before a comma

While tThe moment I see it, my mind is tellingsays to me "you have got to do something about it, even if it's a small thing".

- While implies a duration of time where as 'the moment' implies an instant in time so the two contradict each other. If you use 'the moment' then you need to change 'is telling me' to 'says to me' as the former implies a duration where as the latter implies at an instant in time. I reworded the sentence so that it's told as happening in an instant in time

When iI realilazed it, I started to think how am iI supporsed to actually convince people to be more careful and acknowledge theyir obligatedion to keep safe our world safe because how can we live in a poisoned place where it's destroysing our food scousrces, places, animals and, our health and the ability live, i? It is such an important thing becuause that is why wat we are born for, to experience.

- I is always capitalized when it's by itself in English
- Acknowledge is a better word then 'know' here as it implies 'admitting to themselves'
- Need a question mark to fit with you 'how' question
- The last sentence doesn't make a whole lot of sentence but I fixed it up so it at least is grammatically correct

And then I understood something, I can not convince all the people to change their complusion and have the needed behavior to save and keep our planet safe, But if iI can change at least one of them and even mannage to convince many of them I will have a grope that theirup whose habits will enchanve the eraa positive impact on the health like iof the planet. Instead of trowing trash on the street, just don't be lazy and throw it toin the grarbage and even withhen they sees some trashes on the street, devote manyspend a couple minutes and pick toing up to the grarbage.

- compulsion is quite a strong word and indicates someone is drawn towards doing something which I don't think fits here so changed it to behavior
- There were a couple phrases in here that didn't quite make sense so I reworded trying to keep the message the same

So ithis is necessary to start treating ithis problem as if we really want to live and save our world because this is our burden, and if you can convince and change people's habits, do it for our sake.