With the development of economy，more and more greenhouse gases are being discharged into the air. CO2 makes up about 70% of the greenhouse gases，which is considered to be one of the greatest causes of global warming. It has harmful effects，causing the sea level to rise and many natural disasters to strike.

So we must take effective measures to save our planet. First，we should use more clean energy and less coal and oil. Second，we should go to work on foot or by bus instead of driving a car if possible. Third， we should plant more trees， because plants can turn CO2 into oxygen. More importantly， we should form the habit of saving energy in our daily life.

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随着经济的发展,越来越多的温室气体被排放到空气中。二氧化碳占大约70%的温室气体,这被认为是全球变暖的最大原因之一。它有不良影响,导致海平面上升,许多自然灾害袭击。

所以我们必须采取有效措施来拯救我们的地球。首先,我们应该用更清洁能源和减少煤和石油。第二,我们应该步行去上班或者乘公共汽车而不是驾驶汽车,如果可能的话。第三,我们应该种植更多的树,因为植物可以把二氧化碳转化为氧气。更重要的是,我们应该养成节约能源的好习惯在我们的日常生活中。