Table 2.

Composition of global and the B&R land cover types in 2020.

Range	Global		B&R
Types	Area (103 km2)	Proportion 1 (%)	Area (103 km2)	Proportion 2 (%)	Proportion 3 (%)
Cropland	17,954.35	12.22	13,425.70	74.78	14.52
Forest	45,255.90	30.79	27,388.19	60.52	29.61
Grassland	21,617.28	14.71	16,260.04	75.22	17.58
Shrubland	14,204.26	9.67	9459.67	66.60	10.23
Wetland	1722.89	1.17	1135.25	65.89	1.23
Water body	2974.88	2.02	1247.52	41.93	1.35
Tundra	5314.36	3.62	2031.02	38.22	2.20
Impervious surface	1294.35	0.88	909.23	70.25	0.98
Bareland	22,131.90	15.06	20,423.38	92.28	22.08
Permanent ice/snow	14,489.22	9.86	208.86	1.44	0.23

¹ Area proportion of a type in total global land area. The calculation formula is $S_i/S_g$, where $S_i$ means area of i type, $S_g$ means area of the total global land. ² Area proportion of a type in global land area of that type. The calculation formula is $S_{i,B\&R}/S_{i,global}$, where $S_{i,B\&R}$ means area of i type in B&R, $S_{i,global}$ means area of i type in global. ³ Area proportion of a type in B&R land area. The calculation formula is $S_i/S_{B\&R}$, where $S_i$ means area of i type, $S_{B\&R}$ means area of the B&R land area.