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科学研究表明,大气成分不是一成不变的。以二氧化碳为例,大约从16万年前至公元1800年,其浓度始终保持在0.019%—0.028%之间。空气不能成为化石,二氧化碳的这种变化是怎么知道的呢;
Scientific research shows that the atmospheric composition is not static. Take carbon dioxide as an example, its concentration has remained between 0.019% and 0.028% from about 160,000 years ago to 1800 AD. The air cannot become a fossil. How does this change of carbon dioxide know?