Table 1. Time series models for boreal North America (total) and the two dominant boreal vegetation cover types, tundra and forest.

	Boreal NA	Tundra	Forest
Model type	(1102 × 106 ha)	(142 × 106 ha)	(260 × 106 ha)
Stationary with trend	162 (14.7%)	27.1 (19.1%)	30.9 (11.9%)
Stationary no trend	378 (34.3%)	45.1 (31.8%)	87.9 (33.9%)
Random walk with drift	349 (31.7%)	34.2 (24.1%)	100.7 (38.8%)
Random walk no drift	213 (19.3%)	35.3 (24.9%)	40.0 (15.4%)