Add dataset card for climatelag

DATASET_CARD.md

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+---
+language:
+- en
+license: mit
+task_categories:
+- tabular-classification
+tags:
+- economics
+- climatelag
+- computational-economics
+- environmental/climate-economics
+- emerging-terminology
+pretty_name: Climatelag Economics Dataset
+size_categories:
+- n<1K
+---
+
+# Climatelag Economics Dataset
+
+## Dataset Description
+### Summary
+Synthetic 200-row dataset for `Climatelag` measurement and computational experiments.
+
+### Supported Tasks
+- Economic analysis
+- Environmental/Climate Economics research
+- Computational economics
+
+### Languages
+- English (metadata and documentation)
+- Python (code examples)
+
+## Dataset Structure
+### Data Fields
+- `id`: Unique observation id
+- `year`: Synthetic climate-policy year
+- `emission_flow`: Current greenhouse gas emission flow intensity
+- `atmospheric_stock`: Accumulated atmospheric greenhouse stock pressure
+- `response_delay`: Delay in climate-system response to forcing
+- `damage_realization_lag`: Lag between forcing and realized economic damage
+- `policy_delay`: Delay between policy adoption and effective implementation
+- `discounting_bias`: Present-bias/discounting distortion against long-run damages
+- `adaptation_capacity`: Capacity to adapt and mitigate delayed impacts
+- `climatelag_index`: Composite term index
+
+### Data Splits
+- Full dataset: 200 examples
+
+## Dataset Creation
+### Source Data
+Synthetic data generated for demonstrating Climatelag applications.
+
+### Data Generation
+Channels are sampled from controlled distributions with correlated structure. The term index is computed from normalized channels and directional weights.
+
+## Considerations
+### Social Impact
+Research-only synthetic data for method development and reproducibility testing.
+
+## Additional Information
+### Licensing
+MIT License - free for academic and commercial use.
+
+### Citation
+@dataset{climatelag2026,
+title={{Climatelag Economics Dataset}},
+author={{Economic Research Collective}},
+year={{2026}}
+}