Table 1 Impacts of iterative tiers to account for albedo deductions and benefits

From: Accounting for albedo in carbon market protocols

Tier

Ineligibility threshold

Discounting

Benefits

Projected credits with albedo accounting (million metric tons CO2)

Difference from current projected credits

1

--

--

--

795

N/A

2

100% Median Albedo

--

--

556

30.0% fewer credits

50% Median Albedo

--

--

484

39.1% fewer credits

3

100% Median Albedo

All other albedo deductions

--

425

46.5% fewer credits

50% Median Albedo

All other albedo deductions

--

405

49.0% fewer credits

4

100% Median Albedo

All other albedo deductions

Albedo benefits accounted

429

46.0% fewer credits

50% Median Albedo

All other albedo deductions

Albedo benefits accounted

408

48.6% fewer credits

  1. Tier 1 represents the current projected credits, in million metric tons CO2, expected across all 172 projects assessed from self-reported projections found within each project’s project description. Tier 2 introduces a threshold of albedo deduction beyond which projects would be ineligible (an “ineligibility threshold”), and shows two potential scenarios of ineligibility thresholds: 50% and 100%. These thresholds refer to places where there is a 50% or 100% albedo deduction to the climate benefit. Tier 3 builds on Tier 2. After removing ineligible projects based on the ineligibility threshold, Tier 3 also discounts credits in the remaining eligible projects by their albedo deduction. Tier 4 builds on Tier 3 and allows crediting for projects with a median albedo benefit such that there is an increase in climate mitigation due to changes in albedo. The column “Difference from Current Projected Credits” depicts the impact on credit yield across all projects for each tier deployed.