全球气候变暖是目前人类面临的大环境问题。请你根据以下提示

【答案】

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 to beautify and purify the environment, because plants can turn CO2 into oxygen. More importantly, we should form the habit of saving energy in our daily lire.

【解析】

试题分析：这是一篇提纲类作文，我们需要用正确的英语把给出的要点表达出来.本作文中给出的要点比较具体,故需要准确表达.写作时注意准确运用时态，上下文意思连贯，符合逻辑关系，尽量使用自己熟悉的单词句式，同时也要注意使用高级词汇和高级句型使文章显得更有档次。特别注意在选择句式时要赋予变化。

【亮点说明】本篇书面表达使用了两段式结构，开门见山地点明了现在随着经济增长环境问题越来越严峻；第二段提出了保护环境的一些有效措施，层层递进；本文的亮点是运用了恰当的关联词，如First，second，third，使得文章条理清晰，语句通畅；句式with the development of. 和定语从句等结构的运用也为文章增添了亮色。