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。背景 随着经济的发展，更多的温室气体被排放，其中大约70%为二氧化 碳，这也是全球变暖的主要原因之一。后果 海平面上升；自然灾害频繁。措施 1.多使用清洁能源，少用煤、油； 2.在可能的情况下以步代车； 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.