Carbon dioxide is only a very small percentage of the atmosphere (0.038%) and humans only contribute a small part of the total CO2 emissions in a year (less than 1%).是什么意思_Carbon dioxide is only a very small percentage of the atmosphere (0.038%) and humans only contribute a small part of the total CO2 emissions in a year (less than 1%).在线翻译_英语_读音_用法_例句