全球气候变暖是目前人类面临的最大环境问题。请你根据以下提示，写一篇英语短文，为“节能减排”献计献策。 来源：中国环保联盟 http://www.17huanbao.com
背景：温室气体大量排放
后果：海平面急剧上升，自然灾害频繁
措施：1多使用清洁能源 2以步代车 3….4…
要求：1. 短文必须包括表格中的所有内容要点，可适当发挥，措施中3、4点由考生自由发挥；
2. 词数：100左右。
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.