Global warming is considered an earth killer. And one of the reasons that results in the global warming is greenhouse gases which result from emissions. Those car companies not only sell cars to people but also damage our earth. The 700 million cars currently on the world’s roads produce 2.8 billion tons CO2 annually. This represents 20% of the world’s CO2 emissions. 人類是造成全球暖化的共犯，汽車排放的廢氣每年出產2.8億公噸的二氧化碳，是造成全球氣溫快速成長的主因之一，促使海平面上升、北極熊濒臨絕種、氣溫逐年爬升等，這些廢氣是本世紀最大的環境殺手，嚴重打擊全球生態，該熄火的不是生命！而是那些破壞環境的汽車。