Cong zeng zhang lu jiao du tao lun xian dai wen du yu CO₂ de guang xi

The point of view that green house effects of CO₂ has led to modern global warming still remains debatable,and whether increasing CO₂ concentration drives climate change is also under discussion.According to Newton′s second law,a driving force is directly connected with acceleration.So we propose that the growth rate of CO₂ concentration be introduced into discussing the relationship between changes of global atmospheric temperature and CO2 concentration.Based on this theory and related calculations,it is found that annual mean growth rates of CO₂ concentration （difference of concentrations between the end of December and the start of January within a year） and atmospheric temperature （difference of global annual mean temperature between this and last year） show the same rhythm in annual fluctuations,but it is not the case for long-term geologic periods.Further analysis demonstrates that over long time scale,the change of CO₂ concentration lags behind that of temperature,by which we conclude that CO₂ concentration change is not a driving force of temperature change,but probably a result of the latter.In addition,the same annual rhythm and different long term trends of their growth rates can be attributed to natural and anthropogenic factors,respectively.Linear regression analysis confirms that anthropogenic CO₂ emissions contribute 48.4% to CO₂ concentration variations.