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Global area in forest land use
          continues to decline...

                                     Source
        Year      Remote Sensing           Global Forest Resource
                                                Assessment
                            In millions of hectares
1990                               3 767                     4 168
2000                               3 694                     4 061
...but not as much as previously
               thought

• FAO Forest Resources Assessment estimated a
  loss of 107 million ha from 1990 to 2005
• This survey detected a change of 73 million ha
  for the same period
• A difference of 32%
Nearly 80% of the world’s forests are
  in the tropics and boreal zones
Net change was positive in each climatic
                                    zone except the tropics
                              Boreal      Temperate     Subtropical    Tropical      World
                            90-00 00-05   90-00 00-05   90-00 00-05   90-00 00-05   90-00 00-05


                            10 000
thousands hectares (‘000)




                                                                                                  Gross gain

                                                                                                  Gross loss

                                                                                                  Net change




                            -10 000
Global forest area by region
Area in forest land use by region

                                                  Source
                             Remote Sensing            Global Forest Resource
                                                            Assessment
          Region
                                         In millions of hectares
                            1990          2005             1990         2005
Africa                             518           492              749          691
Asia                               497           516              576          584
Europe (including Russia)     1 080           1 071               989     1 001
North and Central America          736           723              708          705
Oceania                            117           115              199          197
South America                      857           804              946          882
Most forest conversion to other land
                       uses was in South America and Africa
                              Africa         Asia        Europe       N. America     Oceania      S. America
                            90-00 00-05   90-00 00-05   90-00 00-05   90-00 00-05   90-00 00-05   90-00 00-05



                             4 000
thousands hectares (‘000)




                                                                                                                Gross gain

                                                                                                                Gross loss

                                                                                                                Net change




                             -4 000
How did we obtain these
       findings?
Landsat imagery was classified from
 sample sites – classified, reviewed
           and analyzed
A systematic 1 degree grid...




> 13,000 sites worldwide
~10,000 with tree cover
Forest or Non-forest Processing

                                 Land cover changes
1990

                                 Gain in trees (green)

                                 Loss (red stripes)

                                 Shrubs
                                 (young trees?)



2000
                        Change


                        =
Review and revision by 200
national experts....
Conclusions
• Net conversion of forest land is substantially
  lower than previously estimated
• The conversion of forest land into other land
  uses continues most actively in the tropics...
• ... but is also occurring in Europe, North
  America/Central America and Africa
• The methods used in this survey can be used a
  means of improving estimates of forest land use
  change at national, regional and global scales

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Global forest land-use change from 1990 to 2005: Initial results from an FAO global remote sensing survey

  • 1.
  • 2. Global area in forest land use continues to decline... Source Year Remote Sensing Global Forest Resource Assessment In millions of hectares 1990 3 767 4 168 2000 3 694 4 061
  • 3. ...but not as much as previously thought • FAO Forest Resources Assessment estimated a loss of 107 million ha from 1990 to 2005 • This survey detected a change of 73 million ha for the same period • A difference of 32%
  • 4. Nearly 80% of the world’s forests are in the tropics and boreal zones
  • 5. Net change was positive in each climatic zone except the tropics Boreal Temperate Subtropical Tropical World 90-00 00-05 90-00 00-05 90-00 00-05 90-00 00-05 90-00 00-05 10 000 thousands hectares (‘000) Gross gain Gross loss Net change -10 000
  • 6. Global forest area by region
  • 7. Area in forest land use by region Source Remote Sensing Global Forest Resource Assessment Region In millions of hectares 1990 2005 1990 2005 Africa 518 492 749 691 Asia 497 516 576 584 Europe (including Russia) 1 080 1 071 989 1 001 North and Central America 736 723 708 705 Oceania 117 115 199 197 South America 857 804 946 882
  • 8. Most forest conversion to other land uses was in South America and Africa Africa Asia Europe N. America Oceania S. America 90-00 00-05 90-00 00-05 90-00 00-05 90-00 00-05 90-00 00-05 90-00 00-05 4 000 thousands hectares (‘000) Gross gain Gross loss Net change -4 000
  • 9. How did we obtain these findings? Landsat imagery was classified from sample sites – classified, reviewed and analyzed
  • 10. A systematic 1 degree grid... > 13,000 sites worldwide ~10,000 with tree cover
  • 11. Forest or Non-forest Processing Land cover changes 1990 Gain in trees (green) Loss (red stripes) Shrubs (young trees?) 2000 Change =
  • 12. Review and revision by 200 national experts....
  • 13. Conclusions • Net conversion of forest land is substantially lower than previously estimated • The conversion of forest land into other land uses continues most actively in the tropics... • ... but is also occurring in Europe, North America/Central America and Africa • The methods used in this survey can be used a means of improving estimates of forest land use change at national, regional and global scales