假如你是高一学生李华请你写一篇演讲稿,来呼吁大家保护环境, 要点如下，

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Dear students and teachers, my name is Li Hu, a freshman in the school. Nowdays. there is growing concern about the environment all over the world, especially in developing countries like China, Brazil and India. Many large panies base their factories in less-developed countries to circumvent the harsh environmental regulations in their home countries. Although the phenomenon boosts the employment rate in developing countries, it poses serious threat to the environement by releasing industrial waster and medical waste. The waste often fuses major river, thus polluting the source of drinking water. What's more, it also results in acid rain, algal bloom and air pollution. So, students, let's go . We should start to protect the environment. Thank you.