Accounting for albedo in carbon market protocols

Area of Science:

• Climate Science
• Ecology
• Environmental Science

Background:

• Voluntary Carbon Market (VCM) projects, including Afforestation, Reforestation, and Revegetation (ARR), are crucial for climate change mitigation.
• The climate benefits of VCM projects may be inaccurately assessed due to the exclusion of albedo (solar radiation reflection) changes.

Purpose of the Study:

• To quantify the impact of albedo changes on the climate mitigation effectiveness of ARR projects within the VCM.
• To propose methods for incorporating albedo accounting into carbon crediting protocols.

Main Methods:

• Analysis of 172 Afforestation, Reforestation, and Revegetation projects in the VCM.
• Assessment of potential albedo effects on climate mitigation benefits for each project based on location.

Main Results:

• Over 10% of analyzed projects are located in areas where albedo changes could entirely negate their climate mitigation benefits.
• Approximately 25% of projects are in regions where albedo may reduce mitigation benefits by half.
• The majority of projects are situated in areas with minimal expected albedo impact, and 9% are in locations where albedo could enhance mitigation.

Conclusions:

• Current VCM project assessments may overestimate climate benefits by not accounting for albedo changes.
• Incorporating albedo data into carbon crediting protocols can improve accuracy and prioritize projects with genuine climate benefits.
• Further research and tools are needed to account for other biophysical changes like evapotranspiration in VCM project assessments.