我们该感到欣慰，二氧化碳给我们温暖使我们舒舒服服，但是大气中二氧化碳的浓度正在稳步升高，其恶迹也就由此而生。
We can be thankful that carbon dioxide is keeping us comfortably warm , but the concentration of carbon dioxide in the atmosphere is going up steadily and that is where the villainy comes in .
恶迹