Table 2 Fifty ecoregions that contribute most to enhancing biodiversity protection and carbon storage through the addition of currently unprotected lands.

Ecoregion nameIDRealmPotential contribution of
unprotected lands
Median total
carbon density
(MT/ha)
Est. total
carbon
(megatons)
Overlap with mapped
indigenous lands
(km2)(% of land
surface)
(km2)(%
overlap)
Target 1: Conserving the diversity and abundance of life on Earth (terrestrial)
Cluster 1: Species rarity3,047,7872.2775,638526,73917
  Sahelian Acacia Savanna53Afrotropic64,7940.053220712,87320
  Central Range Papuan
Montane Rain Forests
139Australasia49,7940.046613,2911,0072
  Sulawesi Montane Rain
Forests
157Australasia45,0210.035202,34131,67470
  Madagascar Humid Forests17Afrotropic41,7080.033061,2760
  Mindanao-Eastern Visayas
Rain Forests
247Indomalayan41,4920.033151,3076,89017
  Registan-North Pakistan
Sandy Desert
838Palearctic41,4500.0322911320
  Southern Anatolian
Montane Conifer and
Deciduous Forests
804Palearctic40,4820.031516110
  Sulawesi Lowland Rain
Forests
156Australasia38,5420.033891,49917,01644
  Uruguayan Savanna574Neotropic36,7280.0316259510
  Northwest Andean
Montane Forests
486Neotropic36,1370.035061,8294,72713
  Taimyr-Central Siberian
Tundra
781Palearctic35,9320.035491,97329,66083
  Eastern Mediterranean
Conifer-Broadleaf Forests
791Palearctic33,9900.031033502201
  Northeast Siberian Taiga714Palearctic32,5810.025041,6425022
  Humid Chaco571Neotropic31,4790.021966174,57215
  Cerrado567Neotropic30,6020.021283922501
  Eastern Cordillera Real
Montane Forests
460Neotropic30,1330.024701,4167,50925
  Luzon Rain Forests241Indomalayan29,6300.022577613,09910
  Dry Chaco569Neotropic29,2240.021514412,89610
  Somali Acacia-
Commiphora Bushlands
and Thickets
55Afrotropic29,1070.0210430312,05541
  Napo Moist Forests483Neotropic28,2750.024981,40816,29558
  Albertine Rift Montane
Forests
1Afrotropic27,5590.022867881,6976
  Central Asian Northern
Desert
817Palearctic27,4360.02711950
  Kazakh Steppe732Palearctic27,0400.022466650
  Central Bushveld38Afrotropic25,5790.02691760
  Taklimakan Desert843Palearctic25,1650.026315911,54946
Subtotal of top 25 ecoregions879,8810.6624,335164,62319
Cluster 2: Distinct species assemblages8,072,3086.02239,9783,235,85840
  Great Sandy-Tanami Desert210Australasia485,0000.36442,134404,28783
  Southwest Amazon Moist
Forests
505Neotropic390,5910.2929911,679100,61326
  Northeast Congolian
Lowland Forests
24Afrotropic335,6440.252709,06246,10214
  Carpentaria Tropical
Savanna
184Australasia302,4700.23722,178154,44651
  Central Congolian Lowland
Forests
3Afrotropic290,1870.222868,299112,08739
  Northwest Congolian
Lowland Forests
26Afrotropic280,5510.213048,52981,55029
  Guianan Lowland Moist
Forests
465Neotropic270,4020.203118,41065,00224
  Borneo Lowland Rain
Forests
219Indomalayan246,8760.1858814,516179,86673
  Madeira-Tapajós Moist Forests476Neotropic237,6410.182736,48821,8619
  Kimberly Tropical Savanna186Australasia219,7800.16771,692156,68671
Subtotal of top 10 ecoregions3,059,1462.2872,9871,322,50143
Clusters 3 and 4: Rare phenomena and intactness29,929,53522.311,044,78211,249,97938
  East Siberian Taiga710Palearctic3,191,0092.38432137,8512,296,93472
  West Siberian Taiga720Palearctic1,101,6260.82955105,205852,96177
  Scandinavian and Russian
Taiga
717Palearctic907,0790.6846442,088188,61121
  Northeast Siberian Taiga714Palearctic893,3870.6750445,027635,72471
  North Saharan Xeric Steppe
and Woodland
833Palearctic876,3100.65171,490140,66516
  Canadian Middle Arctic
Tundra
414Nearctic811,9540.6155945,388176,02322
  South Sahara Desert842Palearctic772,7010.5811850396,38051
  Taimyr-Central Siberian
Tundra
781Palearctic742,4220.5554940,759557,93475
  Eastern Canadian Shield
Taiga
374Nearctic712,1000.5338627,4871,0070
  Canadian Low Arctic Tundra413Nearctic683,2790.5156338,469162,75824
Subtotal of top 10 ecoregions10,691,8677.97484,61551
Target 2: Enhancing carbon drawdown and storage
Tier 1 climate stabilization areas2,342,9891.7883,087311,33013
  Sarmatic Mixed forests679Palearctic252,4820.1942210,6550
  Kazakh Steppe732Palearctic178,3480.132464,3870
  West Siberian Taiga720Palearctic105,4670.0895510,07256,33353
  Tian Shan Montane Steppe
and Meadows
767Palearctic103,5090.082292,37030,86630
  New England-Acadian
Forests
338Nearctic99,8980.083453,4464450
Subtotal of top 5 ecoregions739,7040.5531,22787,64312