Plot of the increase in green vegetation during the growing season (May through September) between 1982 and 1990 for latitudes north of 27.5°. Green refers to regions where the amount of vegetation increased by up to 5%; pink to a 5-25% increase; red to a 25-55% increase; and orange to a >55% increase. From: R.B. Myneni et al. Increased plant growth in the northern high latitudes from 1981-1991. Nature, 386:698-701, 1997.