Before revision:  Regional variations in CO_2 emissions are significant, with a decrease in China (-9.3\% ) , US (-3.0 \%), Europe ( EU-27 & UK)(-3.3\%) and India (-2.4\%) , respectively.
After revision:  Regional variations in CO_2 emissions are significant, with a decrease in China (-9.3\% ) , -7.1\% compared to 2019), followed by road transportation (145.7 Mt CO2, -8.3 \%), Europe ( EU-27 & UK)(-3.3\%) and India (-2.4\%) , respectively.