假设你是李华，你所居住的城市环境变得越来越差。请你给市长先生写一封信，请求市长关注，简要说明存在的问题，并提出自己的建议。

Dear Mr. Mayor
I am writing about the environmental pollution in our city. The environmental pollution is more and more serious today. We have no clean water to drink because of water pollution. And when trees are cut down some animals disappear. There is more and more dirty smoke in the air. People’s health has been greatly affected by air noise and water pollution. Many people died of diseases. In order to live a better life it’s time for us to protect our world.
Firstly we shouldn’t throw away rubbish everywhere. And we should recycle reduce and reuse things for this saves money and reduces pollution. Use things for as long as possible. Don’t use plastic bags. Also we must plant more trees and stop people cutting them. We hope our world is more and more beautiful.
In short, it is our responsibility to protect our city. I would be grateful if the government could take some steps to solve this environmental problem.
【解析】
【分析】
本篇书面表达是应用文，请你给市长先生写一封信，请求市长关注城市环境的变化。
【详解】第一步：审题
体裁：应用文
时态：根据提示，时态主要为一般现在时。
结构：总分法。总分法指把主题句作为总说，把支持句作为分说，并以这种方式安排所写内容。
要求：1. 存在问题:
1)水污染和大气污染越来越严重；
2)森林被破坏和砍伐；
3)白色垃圾随处可见。
2. 就如何改善和保护环境提出建议。
第二步：列提纲 （重点词组）
environmental; disappear; affect; responsibility; grateful