GTAP Resources: Resource Display
| GTAP Resource #7893 |
|---|
|
"Evaluating Alternative Designs of the 30×30 Biodiversity Target in a Spatially Explicit Global Economic Model" Authors: Haqiqi, Iman and Jonathan Doelman Abstract The global 30×30 biodiversity target introduces a new class of land-use policies with inherently spatial and economy-wide implications. Standard computable general equilibrium (CGE) models typically represent such policies using aggregate land shocks, abstracting from spatial heterogeneity in land quality, biodiversity value, and conversion costs. This paper evaluates how alternative spatial designs of market-based conservation policies affect land use, trade, and economic outcomes within a high-resolution gridded equilibrium framework. We implement a set of land-use tax instruments in the SIMPLE-G model, which represents global production, consumption, and trade with spatially explicit land allocation across cropland, pasture, managed forest, and natural land. All policy scenarios achieve a consistent 30% conservation target at the biome-region level but differ in the spatial structure of taxation: (1) uniform taxes applied across all locations, (2) taxes targeting high-biodiversity grid cells, and (3) differentiated taxes based on biodiversity rankings. The results highlight the importance of spatial targeting in determining both efficiency and system-wide adjustments. Uniform taxes distribute land-use constraints broadly, generating relatively smooth adjustments in production and trade. In contrast, targeted and differentiated taxes concentrate conservation in high-value locations, improving allocation efficiency but inducing stronger spatial reallocation of land use and associated trade responses. These patterns reflect the interaction between local land constraints and global market feedbacks. The analysis demonstrates that incorporating spatial heterogeneity into equilibrium modeling is critical for evaluating land-based conservation policies. It also shows that intermediate policy designs, such as biome-region differentiation, can capture key efficiency gains while remaining tractable for implementation. |
| Resource Details () | GTAP Keywords | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
- Ecosystem services and biodiversity - Environmental policies - Land use - Trade and the environment - Advances in quantitative methods - Model extension/development - Multi-scale and geospatial modeling - Partial and general equilibrium models - Global |
| Attachments |
|---|
|
If you have trouble accessing any of the attachments below due to disability, please contact the authors listed above.
Public Access  GTAP Resource 7893 (647.7 KB) Replicated: 0 time(s)Restricted Access No documents have been attached. Special Instructions No instructions have been specified. |
| Comments (0 posted) |
|---|
|
You must log in before entering comments.
No comments have been posted. |
Last Modified: 4/20/2026 1:44:43 PM
