Fig. 8.
Regression analysis for the effect size of greenhouse gas emission and mean annual precipitation, mean annual temperature at the global level. The red short dash represents the regression analysis of the effect size and mean annual precipitation and mean annual temperature among all studies. The black short dash represents the regression analysis of the effect size and mean annual precipitation in the range from 400 to 700 mm. d-CO2 is the effect size of carbon dioxide, d-CH4 is the effect size of methane, d-N2O is the effect size of nitrous oxide.