Sixth grade environmental protection proposal

Mayor Uncle:
Hello, today I took the liberty to write a letter that I want to reflect to you. This matter has always surrounded me and the people in the whole community.
There is a small river directly opposite my home. In the past, this small river clearly saw the small fish in the river. There is no garbage in the river. Everyone has protection opinions. In spring, I came to the river with my little friends to catch cockroaches, and I often saw those. The "small comma" that is alive and kicking will make us laugh and forget all the troubles. In the summer, that pool of green water has become our paradise. We undressed and played with the little guys in the river. We sometimes play water wars and splash each other with water until the other party concedes defeat. Sometimes we play with water cats and mice to test your suffocating ability and swimming speed. These are the games we often play. In the water, we forget the summer. The heat and troubles, only laughter echoed on the river. Since then, this river has a lot of nicknames, forget the pool, laughter pool, bliss pool and so on.
But now it has changed, the river has become dirty, she has not had a brilliant smile, and she has not had the original tall and straight posture. Under the pollution of people, she has lowered her head like a patient with dying life.
On the left side of the river, the original wasteland was covered by high-rise buildings. They discharged all the industrial sewage machines into the small river. The river became dark and dirty, and the fish, shrimps and donkeys inside died. I can't go swimming any more. Ah, the pool water that brought us joy, what happened to you today! Later, people lived in high-rises, but the residents did not pay attention to environmental awareness, even throwing garbage into the river. Since then, the river has become stinky, and despite the environmental protection boat to clean up, it can be nothing to do. In this way, a beautiful river is far away from us.
Mayor Uncle, can you remind the residents there as you, and build a swimming pool in our community, let us regain joy. This request is not high! I hope you can help me and the community's children realize this wish.