Table 1 Elements of the Global Safety Net to expand protection of terrestrial biodiversity and stabilize climate beyond the current extent of protected areas and a scoping exercise to enhance connectivity.

Dataset nameAreaTotal land surfaceEst. total carbon (24)Overlap with mapped indigenous lands (26)
(km2)(%)(megaton)(km2)(%)
  Total land surface*134,126,000100.002,923,02837,900,30828
  Global terrestrial
protected areas
20,210,87815.07484,9298,032,07840
Unique contribution of currently unprotected lands
Target 1. Conserving the diversity and abundance of life on Earth (terrestrial)
Cluster 1: Species
rarity
3,047,7872.2775,638526,73917
Cluster 2: Distinct species
assemblages
8,072,3086.02239,9783,235,85840
Cluster 3: Rare
phenomena
8,414,1716.27442,6254,092,87349
Cluster 4: Intactness21,515,36416.04602,1577,157,10633
Subtotal41,049,63030.611,360,39915,042,32737
Target 2. Enhancing carbon drawdown and storage
Tier 1 climate
stabilization areas§
2,337,2361.7482,878309,89913
Tier 2 climate
stabilization areas||
3,946,5812.9448,122549,33514
Subtotal6,283,8264.69131,000859,23414
Total area to achieve
targets 1 and 2
47,333,45735.291,420,49915,871,80934
Total area for greater
conservation attention
within the Global
Safety Net (including
current protected areas
(14))
67,544,33550.361,905,42823,903,88735
Target 3. Wildlife and climate corridors: A scoping exercise
Area required if targets 1
and 2 achieved
3,584,614
Area required if targets 1
and 2 are not achieved
(existing protected
areas only)
5,705,206

*On the basis of Earth’s total terrestrial area excluding Antarctica.

†Subtracts overlap with previous datasets.

‡All layers in cluster 1, except rare plant species, include a 1-km buffer around each site.

§Includes ecoregions with median total carbon density above 215 MT/ha.

||Includes ecoregions with median total carbon density between 50 to 215 MT/ha.

¶On the basis of corridor width of 2.5 km.