In the upper drawing, there are fewer trees, while there are quite a lot of thriving trees in the second one. To our delight, birds fly back, and rivers are clean with rich fishes. It shows that the environmental pollution has already been brought under control. The above pictures unveil a prevalent trend for the remarkable progress of China’s environmental protection. At least two fundamental factors could contribute to this phenomenon. The economic development has undergone a booming expansion, making the environmental protection totally ignored. Worse still, the lack of knowledge regarding the environmental protection has brought about immeasurable losses for the environment. Apparently, this trend will surely in turn endanger humankind in the long run. But now with our government’s strong determination and specific measures, pollution has already been well controlled. In conclusion, the good environment can guarantee a country’s sustainable development. In the near future, relevant laws should be drafted to severely punish those who deliberately destroy the environment. In addition, the awareness of the public should be further cultivated so that people throughout the country can get mobilized to protect our homeland.写作要点点拨： At least two fundamental factors could contribute to this phenomenon. 原因解释的万能句子。写完这句话就可以直接写，firstly+原因，secondly+原因。或 on the one hand+ 原因， on the other hand+ 原因。或for one thing +原因，for another thing+原因。

等都是可以的。booming expansion 蓬勃生长的扩张immeasurable 不行计量的endanger 危及sustainable development 可连续生长。

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