Natural Boreal Forest Vegetation Savanna Grassland/Shrubland - PowerPoint PPT Presentation

Tropical Forest Temperate Forest Natural Boreal Forest Vegetation Savanna Grassland/Shrubland Tundra Semi-Desert/Desert/Ice 0 - 10% 10 - 20% 20 - 30% 30 - 40% Croplands 40 - 50% 50 - 60% 60 - 70% 70 - 80% 80 - 90% 90 - 100% 0 - 10% 10 - 20% 20 - 30% Pastures 30 - 40% and 40 - 50% Rangelands 50 - 60% 60 - 70% 70 - 80% 80 - 90% 90 - 100%

Cumulative dependent Cumulative population (billions) population (billions) DI/ Q A/ Q (unitless) Con- (unitless) Sc1 Sc2 Sc3 Con- temporary Sc1 Sc2 Sc3 temporary 1.0 0.9 0.8 1.9 1.6 1.0 1.5 1.4 2.7 2.7 0.4 1.2 1.0 2.4 2.2 0.4 1.9 1.8 3.4 3.3 0.2 1.4 1.3 2.8 2.7 0.2 2.2 2.1 4.0 3.9 0.1 1.7 1.6 3.2 3.2 0.1 2.6 2.5 4.7 4.7 0.01 2.9 2.9 5.4 5.4 0.01 3.8 3.8 6.7 6.6 0.001 4.1 4.1 7.0 7.0 0.001 4.5 4.5 7.6 7.6 0.000 4.8 4.8 8.0 8.0 0.000 4.8 4.8 8.0 8.0

Fig 4. Spatial distribution of net changes in vapor fmows between potential vegetation and actual deforested Fig 1. Spatial distribution of annual water vapor fmows (mm/yr) from potential vegetation before human impacts. and irrigated vegetation in mm/yr.