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Increasing the cost-effectiveness of nutrient reduction targets using different spatial scales
Mikołaj Czajkowski1, Hans E Andersen2, Gitte Blicher-Mathiesen2
1Faculty of Economic Sciences, University of Warsaw, Poland; Charles University, Environmental Center, Czechia.
The Science of the Total Environment
|August 12, 2021
Summary
Setting nutrient reduction targets for the Baltic Sea at a broader scale, like the entire sea basin, is significantly more cost-effective than targeting smaller areas. This approach can reduce costs by up to three times for achieving agricultural nutrient load reductions.
Area of Science:
- Environmental economics
- Marine pollution management
- Agricultural science
Background:
- Nutrient pollution from agriculture is a major stressor for the Baltic Sea.
- Current nutrient reduction targets may not be optimized for cost-effectiveness.
- Spatial scale of policy implementation can significantly impact economic outcomes.
Purpose of the Study:
- To assess the cost-effectiveness of nutrient reduction targets at various spatial scales for the Baltic Sea.
- To analyze the economic implications of agricultural nutrient loadings across different policy targeting levels.
- To inform policy design for water quality improvements in the Baltic Sea region.
Main Methods:
- Utilized a highly-disaggregated model to simulate agricultural profits, nitrogen concentrations, and nutrient transport.
- Compared costs of achieving nutrient load reductions across five spatial scales: Baltic Sea-wide, marine basin, country, watershed, and grid square.
- Model incorporated 14 marine basins, 14 countries, 117 watersheds, and 19,023 grid squares.
Main Results:
- Significant variation in total program costs depending on the spatial scale of nutrient reduction targeting.
- A Baltic Sea-wide target for a 40% load reduction was nearly three times cheaper than a grid-square level target.
- Cost-effectiveness increases substantially as the spatial scale of targeting broadens.
Conclusions:
- Broadening the spatial scale for nutrient reduction targets enhances cost-effectiveness for the Baltic Sea.
- Policy design for non-point source pollution control should consider the scale of implementation for optimal economic outcomes.
- Findings have critical implications for international and domestic environmental policy in the Baltic Sea region.
